From: Fam Zheng <famz@redhat.com>
To: Chris Friesen <chris.friesen@windriver.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] block IO thread creation question
Date: Fri, 25 Mar 2016 10:25:47 +0800 [thread overview]
Message-ID: <20160325022547.GE29171@ad.usersys.redhat.com> (raw)
In-Reply-To: <56F4017D.7040502@windriver.com>
On Thu, 03/24 09:02, Chris Friesen wrote:
> Hi,
>
> Could someone point me at the code for creating threads to handle
> block IO? I'm seeing up to 30 threads per virtual disk, which seems
> high.
It is thread-pool.c, assuming you are using "aio=threads" for drive, which is
the default. With the alternative, "aio=native", spawning worker threads will
be much more uncommon.
Fam
>
> In case it's related, the block devices are iSCSI with the host
> acting as the initiator and exposing block devices to qemu.
>
> I'm particularly interested in qemu 2.2, just in case things have
> changed significantly since then.
>
> Thanks,
> Chris
>
prev parent reply other threads:[~2016-03-25 2:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-24 15:02 [Qemu-devel] block IO thread creation question Chris Friesen
2016-03-25 2:25 ` Fam Zheng [this message]
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