From: Paolo Bonzini <pbonzini@redhat.com>
To: Hu Tao <hutao@cn.fujitsu.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v2 00/15] SCSI s/g + SCSI migration + virtio-scsi
Date: Thu, 09 Feb 2012 08:13:52 +0100 [thread overview]
Message-ID: <4F337230.4000506@redhat.com> (raw)
In-Reply-To: <20120209054607.GA30616@localhost.localdomain>
On 02/09/2012 06:46 AM, Hu Tao wrote:
>>> > >I've re-tested today, with host kernel 2.6.35.6-45.fc14.x86_64,
>>> > >2.6.32-71.el6.x86_64, 3.1.0 and 3.3.0-rc1+, qemu version and guest
>>> > >configuration remain the same, including guest kernel. It apears
>>> > >that the problem appears only when the host kernel version is 3.1.0.
> Sorry, forget about the kernel versions. With very heavy IO load, it's
> easy to reproduce the problem. In my case, 300 disks were attached to a
> virtio-scsi HBA, and 300 dd processes were launched at the same time,
> each for a disk.
Yes, we're not yet optimizing for _that_ kind of scalability. :) That
raw works is already surprising enough to me!
What disk was it? Can you try on an SSD?
Paolo
next prev parent reply other threads:[~2012-02-09 7:14 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-16 16:30 [Qemu-devel] [PATCH v2 00/15] SCSI s/g + SCSI migration + virtio-scsi Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 01/15] dma-helpers: make QEMUSGList target independent Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 02/15] dma-helpers: add dma_buf_read and dma_buf_write Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 03/15] dma-helpers: add accounting wrappers Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 04/15] ahci: use new DMA helpers Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 05/15] scsi: pass residual amount to command_complete Paolo Bonzini
2012-02-10 11:44 ` Stefan Hajnoczi
2012-02-10 11:58 ` Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 06/15] scsi: add scatter/gather functionality Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 07/15] scsi-disk: enable " Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 08/15] scsi: add SCSIDevice vmstate definitions Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 09/15] scsi-generic: add migration support Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 10/15] scsi-disk: " Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 11/15] virtio-scsi: Add virtio-scsi stub device Paolo Bonzini
2012-02-10 12:41 ` Stefan Hajnoczi
2012-02-10 12:46 ` Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 12/15] virtio-scsi: Add basic request processing infrastructure Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 13/15] virtio-scsi: add basic SCSI bus operation Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 14/15] virtio-scsi: process control queue requests Paolo Bonzini
2012-01-16 16:30 ` [Qemu-devel] [PATCH 15/15] virtio-scsi: add migration support Paolo Bonzini
2012-01-18 7:39 ` [Qemu-devel] [PATCH v2 00/15] SCSI s/g + SCSI migration + virtio-scsi Hu Tao
2012-01-19 15:53 ` Paolo Bonzini
2012-01-23 13:36 ` Paolo Bonzini
2012-01-30 9:33 ` Hu Tao
2012-01-31 12:36 ` Paolo Bonzini
2012-02-09 5:46 ` Hu Tao
2012-02-09 7:13 ` Paolo Bonzini [this message]
2012-02-09 8:08 ` Hu Tao
2012-02-10 14:01 ` Stefan Hajnoczi
2012-02-10 14:15 ` Paolo Bonzini
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