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xen-devel
Re: [Xen-devel] poor domU VBD performance.
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To: |
Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] poor domU VBD performance. |
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From: |
Andrew Theurer <habanero@xxxxxxxxxx> |
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Date: |
Thu, 31 Mar 2005 15:27:00 -0600 |
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Cc: |
Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, Xen development list <xen-devel@xxxxxxxxxxxxxxxxxxx>, Kurt Garloff <garloff@xxxxxxx>, Philip R Auld <pauld@xxxxxxxxxxx>, Vincent Hanquez <tab@xxxxxxxxx>, Jens Axboe <axboe@xxxxxxx>, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx> |
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Thu, 31 Mar 2005 21:27:06 +0000 |
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> Could you try again, but replace calls to
> blk_run_queue(plugged_queue) in blkback.c with:
> if ( plugged_queue->unplug_fn )
> plugged_queue->unplug_fn(plugged_queue);
>
> This looks like a better match with what various other drivers do
> (e.g. swraid).
Sorry, It looks like did not get you the whole output, but I can try
what you suggested.
Unable to handle kernel NULL pointer dereference at virtual address
00000000
printing eip:
00000000
*pde = ma 00000000 pa 55555000
[<c02691f1>] blkio_schedule+0x126/0x14c
[<c01147b5>] default_wake_function+0x0/0x12
[<c01147b5>] default_wake_function+0x0/0x12
[<c02690cb>] blkio_schedule+0x0/0x14c
[<c01071f1>] kernel_thread_helper+0x5/0xb
Oops: 0000 [#1]
Modules linked in: ipt_MASQUERADE iptable_nat ip_conntrack ip_tables
qla2300 qla2xxx scsi_transport_fc mptscsih mptbase
CPU: 0
EIP: 0061:[<00000000>] Not tainted VLI
EFLAGS: 00010282 (2.6.11-xen0-up)
EIP is at 0x0
eax: 00000000 ebx: f5ec9b70 ecx: f3e13b64 edx: 00000000
esi: 00000000 edi: c044540c ebp: f7d8dfc0 esp: f7d8df84
ds: 007b es: 007b ss: 0069
Process xenblkd (pid: 730, threadinfo=f7d8c000 task=f7d43020)
Stack: c0217f7d f5ec9b70 f3fee6f0 f7d8c000 c02691f1 f5ec9b70 00000010
00000000
f7d43020 c01147b5 00000000 00000000 fbffc000 00000000 f7d8c000
00000000
f7d43020 c01147b5 00100100 00200200 00000000 00000000 00000000
c02690cb
Call Trace:
[<c0217f7d>] blk_run_queue+0x24/0x47
[<c02691f1>] blkio_schedule+0x126/0x14c
[<c01147b5>] default_wake_function+0x0/0x12
[<c01147b5>] default_wake_function+0x0/0x12
[<c02690cb>] blkio_schedule+0x0/0x14c
[<c01071f1>] kernel_thread_helper+0x5/0xb
Code: Bad EIP value.
>
> Thanks,
> Keir
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