From: Paolo Bonzini <pbonzini@redhat.com>
To: "Wangting (Kathy)" <kathy.wangting@huawei.com>,
qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [question] the patch which affect performance of virtio-scsi
Date: Sun, 08 Feb 2015 11:10:24 +0100 [thread overview]
Message-ID: <54D73610.7080005@redhat.com> (raw)
In-Reply-To: <54D5F660.7030801@huawei.com>
On 07/02/2015 12:26, Wangting (Kathy) wrote:
> OK, Thank you very much for your detailed explanation.
>
> But I have another question about the big change from qemu-1.5.3 to qemu-1.6.0-rc0.
>
> When I use ramdisk for IO performance testing, the result is as follows.
>
> [fio-test] rw bs iodepth jobs bw iops
> ------------------------------------------------------------------------------------
> qemu-1.5.3 read 4k 32 1 285MB/s 73208
> qemu-1.6.0-rc0 read 4k 32 1 253MB/s 64967
>
> And virtio-blk is the same.
>
> I know there are so many differences between qemu-1.5 and qemu-1.6, but I am confused about
> what new features impact the performance so much. Do you know it?
No, sorry. Please try newer versions first and see if this was fixed.
QEMU 1.6 is more than a year old.
Paolo
next prev parent reply other threads:[~2015-02-08 10:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-03 2:31 [Qemu-devel] [question] the patch which affect performance of virtio-scsi Wangting (Kathy)
2015-02-03 2:56 ` Wangting (Kathy)
2015-02-03 8:49 ` Paolo Bonzini
2015-02-07 11:26 ` Wangting (Kathy)
2015-02-08 10:10 ` Paolo Bonzini [this message]
2015-02-09 2:53 ` Wangting (Kathy)
2015-02-03 8:42 ` Paolo Bonzini
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