From: "Benoît Canet" <benoit.canet@irqsave.net>
To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: kwolf@redhat.com, wuzhy@linux.vnet.ibm.com,
qemu-devel@nongnu.org, Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: [Qemu-devel] [PATCH] block: fix bdrv_exceed_iops_limits wait computation
Date: Wed, 20 Mar 2013 16:27:14 +0100 [thread overview]
Message-ID: <20130320152714.GB1473@irqsave.net> (raw)
In-Reply-To: <20130320142842.GA2389@stefanha-thinkpad.muc.redhat.com>
> Now there is no oscillation and the wait_times do not grow or shrink
> under constant load from dd(1).
>
> Can you try this patch by itself to see if it fixes the oscillation?
On my test setup it fixes the oscillation and lead to an average 149.88 iops.
However another pattern appear.
iostat -d 1 -x will show something between 150 and 160 iops for several sample
then a sample would show around 70 iops to compensate for the additional ios
and this cycle restart.
Best regards
Benoît
next prev parent reply other threads:[~2013-03-20 15:26 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-20 9:12 [Qemu-devel] [PATCH] Fix I/O throttling pathologic oscillating behavior Benoît Canet
2013-03-20 9:12 ` [Qemu-devel] [PATCH] block: fix bdrv_exceed_iops_limits wait computation Benoît Canet
2013-03-20 10:55 ` Zhi Yong Wu
2013-03-20 13:29 ` Stefan Hajnoczi
2013-03-20 14:28 ` Stefan Hajnoczi
2013-03-20 14:56 ` Benoît Canet
2013-03-20 15:12 ` Stefan Hajnoczi
2013-03-21 1:18 ` Zhi Yong Wu
2013-03-21 9:17 ` Stefan Hajnoczi
2013-03-21 13:04 ` Zhi Yong Wu
2013-03-21 15:14 ` Stefan Hajnoczi
2013-03-20 15:27 ` Benoît Canet [this message]
2013-03-21 10:34 ` Stefan Hajnoczi
2013-03-21 14:28 ` Benoît Canet
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