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Re: [Qemu-devel] virtio-scsi vs. virtio-blk

From: Stefan Priebe - Profihost AG
Subject: Re: [Qemu-devel] virtio-scsi vs. virtio-blk
Date: Thu, 09 Aug 2012 17:41:31 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120714 Thunderbird/14.0

OK VMs do work fine now. Sorry for missing the patch after switching to qemu-kvm.

Am 09.08.2012 14:44, schrieb Paolo Bonzini:
Ok, try deadline in the guest then.  Using noop amplifies bad
performance, because you lose request merging.  With no host scheduler,
as is the case with libiscsi, noop is rarely a good idea.

Tests with cache=none and deadline:
  write: io=8267MB, bw=94023KB/s, iops=23505, runt= 90032msec
  read : io=14576MB, bw=165783KB/s, iops=41445, runt= 90035msec
  write: io=21312MB, bw=240782KB/s, iops=58, runt= 90636msec
  read : io=48072MB, bw=544882KB/s, iops=133, runt= 90342msec

  write: io=9210MB, bw=104710KB/s, iops=26177, runt= 90070msec
  read : io=18804MB, bw=213929KB/s, iops=53482, runt= 90006msec
  write: io=29080MB, bw=329478KB/s, iops=80, runt= 90379msec
  read : io=26328MB, bw=298159KB/s, iops=72, runt= 90421msec

So this looks OK to me. Do you agree? So with virtio-scsi discard should work?

Greets and many thanks

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