Symptôme : vous êtes sur votre bête de course (sous GNU Linux bien entendu) et vous copiez, chargez des gros fichiers. Puis, plus rien, l'écran se fige. Plus aucun périphérique ne réponds (clavier, souris, etc). Super, vous êtes tombé sur le Freeze machine comme on les aime. Par voie de conséquence, je fais un premier hard reboot explosif.
Cela faisait une éternité (genre + de 3 ans) que je n'ai pas réussi à geler une machine personnelle (hors celles de développement -_-). Je recommence la copie et BAM refreeze au bout d'1 à 2 minutes. (2ème Hard Reboot mode explosif)
Les lockups sont difficiles à cerner car généralement nous ne savons par où commencer. Comme tout à chacun, j'ai commencé par blâmer les disques et les systèmes de fichier. Du coup, je passe en mode secours "MacGyver" avec le Live CD et la commande e2fsck pour traquer l'anomalie sur les systèmes de fichiers mais rien. Fausse piste.
Du côté du journal d'événement, rien de miraculeux (attention c'est un peu verbeux) :
Les 5 premières secondes particulièrement pompeuses ont été retirées
May 27 11:42:35 home01 kernel: [ 5.447313] usb usb10: No SuperSpeed endpoint companion for config 1 interface 0 altsetting 0 ep 129: using minimum values
May 27 11:42:35 home01 kernel: [ 5.447404] xHCI xhci_add_endpoint called for root hub
May 27 11:42:35 home01 kernel: [ 5.447409] xHCI xhci_check_bandwidth called for root hub
May 27 11:42:35 home01 kernel: [ 5.447436] hub 10-0:1.0: USB hub found
May 27 11:42:35 home01 kernel: [ 5.447440] hub 10-0:1.0: 4 ports detected
May 27 11:42:35 home01 kernel: [ 5.500394] hda_codec: ALC889: BIOS auto-probing.
May 27 11:42:35 home01 kernel: [ 5.509177] input: HDA Intel Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input5
May 27 11:42:35 home01 kernel: [ 5.509276] HDA Intel 0000:01:00.1: PCI INT B -> GSI 17 (level, low) -> IRQ 17
May 27 11:42:35 home01 kernel: [ 5.509278] hda_intel: Disable MSI for Nvidia chipset
May 27 11:42:35 home01 kernel: [ 5.509313] HDA Intel 0000:01:00.1: setting latency timer to 64
May 27 11:42:35 home01 kernel: [ 5.544666] EXT4-fs (sda1): warning: maximal mount count reached, running e2fsck is recommended
May 27 11:42:35 home01 kernel: [ 5.557815] EXT4-fs (sda1): recovery complete
May 27 11:42:35 home01 kernel: [ 5.567065] EXT4-fs (sda1): mounted filesystem with writeback data mode. Opts: data=writeback
May 27 11:42:35 home01 kernel: [ 5.702843] type=1400 audit(1306489355.878:5): apparmor="STATUS" operation="profile_load" name="/usr/share/gdm/guest-session/Xsession" pid=948 comm="apparmor_parser"
May 27 11:42:35 home01 kernel: [ 5.703854] type=1400 audit(1306489355.888:6): apparmor="STATUS" operation="profile_load" name="/usr/lib/cups/backend/cups-pdf" pid=952 comm="apparmor_parser"
May 27 11:42:35 home01 kernel: [ 5.706014] type=1400 audit(1306489355.888:7): apparmor="STATUS" operation="profile_load" name="/usr/sbin/cupsd" pid=952 comm="apparmor_parser"
May 27 11:42:35 home01 kernel: [ 5.706052] type=1400 audit(1306489355.888:8): apparmor="STATUS" operation="profile_replace" name="/sbin/dhclient" pid=949 comm="apparmor_parser"
May 27 11:42:35 home01 kernel: [ 5.706585] type=1400 audit(1306489355.888:9): apparmor="STATUS" operation="profile_replace" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=949 comm="apparmor_parser"
May 27 11:42:35 home01 kernel: [ 5.706934] type=1400 audit(1306489355.888:10): apparmor="STATUS" operation="profile_replace" name="/usr/lib/connman/scripts/dhclient-script" pid=949 comm="apparmor_parser"
May 27 11:42:35 home01 kernel: [ 5.764488] r8169 0000:06:00.0: eth0: link down
May 27 11:42:35 home01 kernel: [ 5.764498] r8169 0000:06:00.0: eth0: link down
May 27 11:42:35 home01 kernel: [ 5.764999] ADDRCONF(NETDEV_UP): eth0: link is not ready
May 27 11:42:36 home01 kernel: [ 5.856723] vboxdrv: Found 8 processor cores.
May 27 11:42:36 home01 kernel: [ 5.856919] vboxdrv: fAsync=0 offMin=0x1de offMax=0x427e
May 27 11:42:36 home01 kernel: [ 5.856962] vboxdrv: TSC mode is 'synchronous', kernel timer mode is 'normal'.
May 27 11:42:36 home01 kernel: [ 5.856964] vboxdrv: Successfully loaded version 4.0.4_OSE (interface 0x00160000).
May 27 11:42:36 home01 kernel: [ 6.033727] EXT4-fs (sdb3): Ignoring deprecated nobh option
May 27 11:42:36 home01 kernel: [ 6.033741] EXT4-fs (sdb3): re-mounted. Opts: data=writeback,barrier=0,nobh,errors=remount-ro,commit=0
May 27 11:42:36 home01 kernel: [ 6.035912] EXT4-fs (sda1): re-mounted. Opts: data=writeback,commit=0
May 27 11:42:38 home01 kernel: [ 7.941778] nvidia 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
May 27 11:42:38 home01 kernel: [ 7.941789] nvidia 0000:01:00.0: setting latency timer to 64
May 27 11:42:38 home01 kernel: [ 7.941793] vgaarb: device changed decodes: PCI:0000:01:00.0,olddecodes=io+mem,decodes=none:owns=io+mem
May 27 11:42:38 home01 kernel: [ 7.941925] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 270.41.06 Mon Apr 18 14:53:56 PDT 2011
May 27 11:42:38 home01 kernel: [ 7.975030] vesafb: framebuffer at 0xed000000, mapped to 0xffffc90008580000, using 1216k, total 1216k
May 27 11:42:38 home01 kernel: [ 7.975034] vesafb: mode is 640x480x32, linelength=2560, pages=0
May 27 11:42:38 home01 kernel: [ 7.975035] vesafb: scrolling: redraw
May 27 11:42:38 home01 kernel: [ 7.975037] vesafb: Truecolor: size=8:8:8:8, shift=24:16:8:0
May 27 11:42:38 home01 kernel: [ 7.975155] Console: switching to colour frame buffer device 80x30
May 27 11:42:38 home01 kernel: [ 7.979522] audit_printk_skb: 12 callbacks suppressed
May 27 11:42:38 home01 kernel: [ 7.979523] type=1400 audit(1306489358.158:15): apparmor="STATUS" operation="profile_replace" name="/usr/lib/cups/backend/cups-pdf" pid=1318 comm="apparmor_parser"
May 27 11:42:38 home01 kernel: [ 7.980104] type=1400 audit(1306489358.158:16): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/cupsd" pid=1318 comm="apparmor_parser"
May 27 11:42:38 home01 kernel: [ 8.013739] fb0: VESA VGA frame buffer device
May 27 11:42:38 home01 kernel: [ 8.134566] ioremap error for 0xdf7d1000-0xdf7d2000, requested 0x10, got 0x0
May 27 11:42:39 home01 kernel: [ 9.301019] EXT4-fs (sdb3): Ignoring deprecated nobh option
May 27 11:42:39 home01 kernel: [ 9.301027] EXT4-fs (sdb3): re-mounted. Opts: data=writeback,barrier=0,nobh,errors=remount-ro,commit=0
May 27 11:42:39 home01 kernel: [ 9.302877] EXT4-fs (sda1): re-mounted. Opts: data=writeback,commit=0
May 27 11:42:39 home01 kernel: [ 9.559678] r8169 0000:06:00.0: eth0: link up
May 27 11:42:39 home01 kernel: [ 9.560134] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
May 27 11:42:40 home01 kernel: [ 10.795361] RPC: Registered udp transport module.
May 27 11:42:40 home01 kernel: [ 10.795364] RPC: Registered tcp transport module.
May 27 11:42:40 home01 kernel: [ 10.795365] RPC: Registered tcp NFSv4.1 backchannel transport module.
May 27 11:42:41 home01 kernel: [ 10.802957] FS-Cache: Loaded
May 27 11:42:41 home01 kernel: [ 10.814580] FS-Cache: Netfs 'nfs' registered for caching
May 27 11:42:41 home01 kernel: [ 11.086066] svc: failed to register lockdv1 RPC service (errno 97).
May 27 11:42:41 home01 kernel: [ 11.442578] hda-intel: IRQ timing workaround is activated for card #1. Suggest a bigger bdl_pos_adj.
May 27 11:42:50 home01 kernel: [ 20.189693] eth0: no IPv6 routers present
May 27 11:42:52 home01 kernel: [ 22.218461] CE: hpet2 increased min_delta_ns to 7500 nsec
May 27 11:42:52 home01 kernel: [ 22.218469] CE: hpet2 increased min_delta_ns to 11250 nsec
May 27 11:42:52 home01 kernel: [ 22.218472] hrtimer: interrupt took 4564 ns
May 27 11:42:54 home01 kernel: [ 24.137550] CE: hpet6 increased min_delta_ns to 7500 nsec
May 27 11:42:54 home01 kernel: [ 24.137556] CE: hpet6 increased min_delta_ns to 11250 nsec
May 27 11:42:56 home01 kernel: [ 25.926711] CE: hpet3 increased min_delta_ns to 7500 nsec
May 27 11:42:56 home01 kernel: [ 25.926721] CE: hpet3 increased min_delta_ns to 11250 nsec
May 27 11:42:57 home01 kernel: [ 27.483274] CE: hpet5 increased min_delta_ns to 7500 nsec
May 27 11:42:57 home01 kernel: [ 27.483282] CE: hpet5 increased min_delta_ns to 11250 nsec
May 27 11:43:02 home01 kernel: [ 32.243730] CE: hpet4 increased min_delta_ns to 7500 nsec
May 27 11:43:02 home01 kernel: [ 32.243738] CE: hpet4 increased min_delta_ns to 11250 nsec
May 27 11:44:25 home01 kernel: [ 114.754945] r8169 0000:06:00.0: eth0: link up
May 27 11:44:25 home01 kernel: [ 114.754961] NOHZ: local_softirq_pending 08
May 27 11:45:06 home01 kernel: [ 156.135457] r8169 0000:06:00.0: eth0: link up
May 27 11:45:06 home01 kernel: [ 156.135469] NOHZ: local_softirq_pending 08
May 27 11:45:06 home01 kernel: [ 156.265357] r8169 0000:06:00.0: eth0: link up
May 27 11:45:06 home01 kernel: [ 156.265373] NOHZ: local_softirq_pending 08
May 27 11:45:06 home01 kernel: [ 156.271621] NOHZ: local_softirq_pending 08
May 27 11:45:07 home01 kernel: [ 156.755147] r8169 0000:06:00.0: eth0: link up
May 27 11:45:08 home01 kernel: [ 158.224469] r8169 0000:06:00.0: eth0: link up
May 27 11:45:08 home01 kernel: [ 158.224485] NOHZ: local_softirq_pending 08
May 27 11:45:08 home01 kernel: [ 158.294458] r8169 0000:06:00.0: eth0: link up
May 27 11:45:08 home01 kernel: [ 158.294473] NOHZ: local_softirq_pending 08
May 27 11:45:09 home01 kernel: [ 158.994106] r8169 0000:06:00.0: eth0: link up
May 27 11:45:09 home01 kernel: [ 158.994121] NOHZ: local_softirq_pending 08
May 27 11:45:09 home01 kernel: [ 159.263954] r8169 0000:06:00.0: eth0: link up
May 27 11:45:10 home01 kernel: [ 160.163562] r8169 0000:06:00.0: eth0: link up
May 27 11:45:10 home01 kernel: [ 160.163574] NOHZ: local_softirq_pending 08
May 27 11:45:10 home01 kernel: [ 160.313501] r8169 0000:06:00.0: eth0: link up
May 27 11:45:10 home01 kernel: [ 160.313517] NOHZ: local_softirq_pending 08
May 27 11:45:11 home01 kernel: [ 160.763395] NOHZ: local_softirq_pending 08
May 27 11:45:12 home01 kernel: [ 162.132681] net_ratelimit: 1 callbacks suppressed
May 27 11:45:12 home01 kernel: [ 162.132687] r8169 0000:06:00.0: eth0: link up
May 27 11:45:12 home01 kernel: [ 162.402502] r8169 0000:06:00.0: eth0: link up
May 27 11:45:12 home01 kernel: [ 162.472410] r8169 0000:06:00.0: eth0: link up
May 27 11:45:13 home01 kernel: [ 162.962189] r8169 0000:06:00.0: eth0: link up
May 27 11:45:13 home01 kernel: [ 163.242066] r8169 0000:06:00.0: eth0: link up
May 27 11:45:13 home01 kernel: [ 163.382005] r8169 0000:06:00.0: eth0: link up
May 27 11:45:13 home01 kernel: [ 163.521966] r8169 0000:06:00.0: eth0: link up
May 27 11:45:14 home01 kernel: [ 163.801795] r8169 0000:06:00.0: eth0: link up
May 27 11:45:14 home01 kernel: [ 164.161684] r8169 0000:06:00.0: eth0: link up
May 27 11:45:14 home01 kernel: [ 164.571430] r8169 0000:06:00.0: eth0: link up
May 27 11:45:19 home01 kernel: [ 169.169269] net_ratelimit: 6 callbacks suppressed
May 27 11:45:19 home01 kernel: [ 169.169276] r8169 0000:06:00.0: eth0: link up
May 27 11:45:19 home01 kernel: [ 169.669074] r8169 0000:06:00.0: eth0: link up
May 27 11:45:20 home01 kernel: [ 170.638657] r8169 0000:06:00.0: eth0: link up
May 27 11:45:21 home01 kernel: [ 170.768551] r8169 0000:06:00.0: eth0: link up
May 27 11:45:21 home01 kernel: [ 171.058362] r8169 0000:06:00.0: eth0: link up
May 27 11:45:21 home01 kernel: [ 171.538208] r8169 0000:06:00.0: eth0: link up
May 27 11:45:22 home01 kernel: [ 172.377840] r8169 0000:06:00.0: eth0: link up
May 27 11:45:22 home01 kernel: [ 172.517662] r8169 0000:06:00.0: eth0: link up
May 27 11:45:23 home01 kernel: [ 173.077423] r8169 0000:06:00.0: eth0: link up
May 27 11:45:24 home01 kernel: [ 174.596723] r8169 0000:06:00.0: eth0: link up
May 27 11:45:26 home01 kernel: [ 175.736249] r8169 0000:06:00.0: eth0: link up
May 27 11:45:27 home01 kernel: [ 177.405393] r8169 0000:06:00.0: eth0: link up
May 27 11:45:27 home01 kernel: [ 177.685257] r8169 0000:06:00.0: eth0: link up
May 27 11:45:28 home01 kernel: [ 177.975117] r8169 0000:06:00.0: eth0: link up
May 27 11:45:28 home01 kernel: [ 178.105151] r8169 0000:06:00.0: eth0: link up
May 27 11:45:28 home01 kernel: [ 178.384988] r8169 0000:06:00.0: eth0: link up
May 27 11:45:28 home01 kernel: [ 178.704755] r8169 0000:06:00.0: eth0: link up
May 27 11:45:29 home01 kernel: [ 179.014860] r8169 0000:06:00.0: eth0: link up
May 27 11:45:29 home01 kernel: [ 179.434455] r8169 0000:06:00.0: eth0: link up
May 27 11:45:29 home01 kernel: [ 179.654480] r8169 0000:06:00.0: eth0: link up
May 27 11:45:32 home01 kernel: [ 182.413126] net_ratelimit: 7 callbacks suppressed
May 27 11:45:32 home01 kernel: [ 182.413133] r8169 0000:06:00.0: eth0: link up
May 27 11:45:33 home01 kernel: [ 183.542481] r8169 0000:06:00.0: eth0: link up
May 27 11:45:34 home01 kernel: [ 184.242176] r8169 0000:06:00.0: eth0: link up
May 27 11:45:35 home01 kernel: [ 185.581600] r8169 0000:06:00.0: eth0: link up
May 27 11:45:36 home01 kernel: [ 185.971446] r8169 0000:06:00.0: eth0: link up
May 27 11:45:36 home01 kernel: [ 186.041435] r8169 0000:06:00.0: eth0: link up
May 27 11:45:36 home01 kernel: [ 186.291355] r8169 0000:06:00.0: eth0: link up
May 27 11:45:36 home01 kernel: [ 186.541117] r8169 0000:06:00.0: eth0: link up
May 27 11:45:37 home01 kernel: [ 187.170877] r8169 0000:06:00.0: eth0: link up
May 27 11:45:37 home01 kernel: [ 187.390805] r8169 0000:06:00.0: eth0: link up
May 27 11:45:39 home01 kernel: [ 189.359872] net_ratelimit: 6 callbacks suppressed
May 27 11:45:39 home01 kernel: [ 189.359879] r8169 0000:06:00.0: eth0: link up
May 27 11:45:40 home01 kernel: [ 190.029434] r8169 0000:06:00.0: eth0: link up
May 27 11:45:40 home01 kernel: [ 190.519276] r8169 0000:06:00.0: eth0: link up
May 27 11:45:40 home01 kernel: [ 190.649129] r8169 0000:06:00.0: eth0: link up
May 27 11:45:41 home01 kernel: [ 191.428869] r8169 0000:06:00.0: eth0: link up
May 27 11:45:42 home01 kernel: [ 191.848575] r8169 0000:06:00.0: eth0: link up
May 27 11:45:42 home01 kernel: [ 192.298432] r8169 0000:06:00.0: eth0: link up
May 27 11:45:43 home01 kernel: [ 193.587759] r8169 0000:06:00.0: eth0: link up
May 27 11:45:43 home01 kernel: [ 193.657813] r8169 0000:06:00.0: eth0: link up
May 27 11:45:44 home01 kernel: [ 193.837937] r8169 0000:06:00.0: eth0: link up
May 27 11:45:45 home01 kernel: [ 195.307164] net_ratelimit: 3 callbacks suppressed
May 27 11:45:45 home01 kernel: [ 195.307171] r8169 0000:06:00.0: eth0: link up
May 27 11:45:45 home01 kernel: [ 195.466971] r8169 0000:06:00.0: eth0: link up
May 27 11:45:46 home01 kernel: [ 196.096693] r8169 0000:06:00.0: eth0: link up
May 27 11:45:47 home01 kernel: [ 197.286001] r8169 0000:06:00.0: eth0: link up
May 27 11:45:47 home01 kernel: [ 197.395946] r8169 0000:06:00.0: eth0: link up
May 27 11:45:49 home01 kernel: [ 198.745369] r8169 0000:06:00.0: eth0: link up
May 27 11:45:49 home01 kernel: [ 199.435125] r8169 0000:06:00.0: eth0: link up
May 27 11:45:49 home01 kernel: [ 199.544995] r8169 0000:06:00.0: eth0: link up
May 27 11:45:49 home01 kernel: [ 199.644936] r8169 0000:06:00.0: eth0: link up
May 27 11:45:50 home01 kernel: [ 199.784821] r8169 0000:06:00.0: eth0: link up
May 27 11:45:51 home01 kernel: [ 200.994345] net_ratelimit: 1 callbacks suppressed
May 27 11:45:51 home01 kernel: [ 200.994351] r8169 0000:06:00.0: eth0: link up
May 27 11:45:51 home01 kernel: [ 201.214195] r8169 0000:06:00.0: eth0: link up
May 27 11:45:51 home01 kernel: [ 201.434195] r8169 0000:06:00.0: eth0: link up
May 27 11:45:53 home01 kernel: [ 203.373323] r8169 0000:06:00.0: eth0: link up
May 27 11:45:53 home01 kernel: [ 203.483165] r8169 0000:06:00.0: eth0: link up
May 27 11:45:53 home01 kernel: [ 203.603131] r8169 0000:06:00.0: eth0: link up
May 27 11:45:54 home01 kernel: [ 204.472628] r8169 0000:06:00.0: eth0: link up
May 27 11:45:54 home01 kernel: [ 204.612646] r8169 0000:06:00.0: eth0: link up
May 27 11:45:55 home01 kernel: [ 205.272309] r8169 0000:06:00.0: eth0: link up
May 27 11:45:55 home01 kernel: [ 205.342344] r8169 0000:06:00.0: eth0: link up
May 27 11:45:56 home01 kernel: [ 206.501724] net_ratelimit: 1 callbacks suppressed
May 27 11:45:56 home01 kernel: [ 206.501731] r8169 0000:06:00.0: eth0: link up
May 27 11:45:57 home01 kernel: [ 207.061401] r8169 0000:06:00.0: eth0: link up
May 27 11:45:57 home01 kernel: [ 207.201335] r8169 0000:06:00.0: eth0: link up
May 27 11:45:57 home01 kernel: [ 207.681118] r8169 0000:06:00.0: eth0: link up
May 27 11:45:59 home01 kernel: [ 208.940520] r8169 0000:06:00.0: eth0: link up
May 27 11:45:59 home01 kernel: [ 209.060504] r8169 0000:06:00.0: eth0: link up
May 27 11:45:59 home01 kernel: [ 209.160533] r8169 0000:06:00.0: eth0: link up
May 27 11:45:59 home01 kernel: [ 209.390487] r8169 0000:06:00.0: eth0: link up
May 27 11:46:00 home01 kernel: [ 210.059983] r8169 0000:06:00.0: eth0: link up
May 27 11:46:01 home01 kernel: [ 210.749668] r8169 0000:06:00.0: eth0: link up
May 27 11:46:02 home01 kernel: [ 212.639067] net_ratelimit: 1 callbacks suppressed
May 27 11:46:02 home01 kernel: [ 212.639071] r8169 0000:06:00.0: eth0: link up
May 27 11:46:04 home01 kernel: [ 214.408054] r8169 0000:06:00.0: eth0: link up
May 27 11:46:05 home01 kernel: [ 214.937765] r8169 0000:06:00.0: eth0: link up
May 27 11:46:06 home01 kernel: [ 216.137189] r8169 0000:06:00.0: eth0: link up
May 27 11:46:06 home01 kernel: [ 216.437041] r8169 0000:06:00.0: eth0: link up
May 27 11:46:06 home01 kernel: [ 216.546989] r8169 0000:06:00.0: eth0: link up
May 27 11:46:07 home01 kernel: [ 217.336717] r8169 0000:06:00.0: eth0: link up
May 27 11:46:09 home01 kernel: [ 218.995889] r8169 0000:06:00.0: eth0: link up
May 27 11:46:09 home01 kernel: [ 219.605539] r8169 0000:06:00.0: eth0: link up
May 27 11:46:10 home01 kernel: [ 220.585029] r8169 0000:06:00.0: eth0: link up
May 27 11:46:14 home01 kernel: [ 223.753670] r8169 0000:06:00.0: eth0: link up------------------------------ CRASH -----------------------------
Deuxième fausse piste : faisant une copie depuis un répertoire NFS sur un NAS, je pense que le message "NOHZ: local_softirq_pending 08" est important. Après épluchage d'une bonne centaine de forums, il s'agit plus d'un vieux spam indésirable dans la log que d'une erreur "sérieuse".
La piste est venue du post suivant : http://kubuntuforums.net/forums/index.php?topic=3114285.0
Dans le post, la fonctionnalité HPET est mise en cause. Pour rappel, voici dans la log du kernel ci-dessus les entrées HPET ci référant :
May 27 11:42:54 home01 kernel: [ 24.137550] CE: hpet6 increased min_delta_ns to 7500 nsec
May 27 11:42:54 home01 kernel: [ 24.137556] CE: hpet6 increased min_delta_ns to 11250 nsec
May 27 11:42:56 home01 kernel: [ 25.926711] CE: hpet3 increased min_delta_ns to 7500 nsec
May 27 11:42:56 home01 kernel: [ 25.926721] CE: hpet3 increased min_delta_ns to 11250 nsec
May 27 11:42:57 home01 kernel: [ 27.483274] CE: hpet5 increased min_delta_ns to 7500 nsec
May 27 11:42:57 home01 kernel: [ 27.483282] CE: hpet5 increased min_delta_ns to 11250 nsec
May 27 11:43:02 home01 kernel: [ 32.243730] CE: hpet4 increased min_delta_ns to 7500 nsec
May 27 11:43:02 home01 kernel: [ 32.243738] CE: hpet4 increased min_delta_ns to 11250 nsec
Mais qu'est ce que le HPET ???
L'article de wikipedia (http://en.wikipedia.org/wiki/High_Precision_Event_Timer) est assez complet et bien écrit. Donc, comme le café Maxwel, pas la peine d'en rajouter.
Il s'agit d'une technologie développée par Intel pour améliorer la précision de requêtes d'interruption et du coup "en passant" alléger celles gérées par le CPU... enfin pas de quoi tricoter une nouille. Normalement le Kernel Linux le gère depuis le 2.6
Ca tombe bien, j'utilise un Ubuntu 11.04 (tout le monde a des défauts) avec un kernel 2.6.38-8-generic. J'essaie donc de désactiver cette fonctionnalité dans le BIOS de la carte mère. Et je m'aperçois que le HPET est mode 32bits (j'utilise un kernel 64bits)..... Pour m'épargner des galères, je décide de désactiver depuis le BIOS le HPET.
Enregistrement du BIOS. Redémarrage. Test de la copie de fichier. Réussi. Plus de freeze.
Mission accomplie.