From: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: qemu-devel@nongnu.org
Subject: [Qemu-devel] Question about posixaio thread number.
Date: Wed, 03 Aug 2011 13:19:40 +0800 [thread overview]
Message-ID: <4E38DA6C.7070406@cn.fujitsu.com> (raw)
Hi Anthony,
I started a guest with cache=none and aio=threads
When i did some io tests in Guest say dd like
dd if=/dev/zero oflag=direct of=/mnt/sdb1/date.img bs=4k count=262114
qemu will start one or several threads to perform IO requests.
It seems qemu makes use of its own posixaio. I'm wondering how qemu
decides how many threads should be created to perform io operation?
Thanks,
Gui
next reply other threads:[~2011-08-03 6:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-03 5:19 Gui Jianfeng [this message]
2011-08-03 6:33 ` [Qemu-devel] Question about posixaio thread number Gui Jianfeng
2011-08-03 7:23 ` Stefan Hajnoczi
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