From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: "Duan, Ronghui" <ronghui.duan@intel.com>
Cc: "'xen-devel@lists.xen.org'" <xen-devel@lists.xen.org>,
'Ian Jackson' <Ian.Jackson@eu.citrix.com>,
'Jan Beulich' <JBeulich@suse.com>,
'Stefano Stabellini' <stefano.stabellini@eu.citrix.com>
Subject: Re: [RFC v1 0/5] VBD: enlarge max segment per request in blkfront
Date: Wed, 19 Sep 2012 17:11:03 -0400 [thread overview]
Message-ID: <20120919211103.GA9488@phenom.dumpdata.com> (raw)
In-Reply-To: <A21691DE07B84740B5F0B81466D5148A23BF7E2F@SHSMSX102.ccr.corp.intel.com>
On Mon, Sep 17, 2012 at 06:33:29AM +0000, Duan, Ronghui wrote:
> At last, I saw the regression in random io.
> This is a patch to fix the performance regression. Original the pending request members are allocated from the stack, I alloc them when each request arrives in my last patch. But it will hurt performance. In this fix, I alloc all of them when blkback init. But due to some bugs there, we can't free it, the same to other pending requests member. I am looking for the reason. But have no idea for this now.
> Konrad, thanks for your comments. Could you have a try when you have time.
Sure. I get now:
read : io=4096.0MB, bw=144258KB/s, iops=36064 , runt= 29075msec
so much better I/O.
> > > > > >> And with your patch got:
> > > > > >> read : io=4096.0MB, bw=92606KB/s, iops=23151 , runt=
> > > > > >> 45292msec
> > > > > >>
> > > > > >> without:
> > > > > >> read : io=4096.0MB, bw=145187KB/s, iops=36296 , runt=
> > > > > >> 28889msec
next prev parent reply other threads:[~2012-09-19 21:11 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-16 10:22 [RFC v1 0/5] VBD: enlarge max segment per request in blkfront Duan, Ronghui
2012-08-16 11:14 ` Jan Beulich
2012-08-17 1:12 ` Duan, Ronghui
2012-08-16 13:34 ` Konrad Rzeszutek Wilk
2012-08-16 13:55 ` Konrad Rzeszutek Wilk
2012-08-17 1:26 ` Duan, Ronghui
2012-08-16 14:18 ` Jan Beulich
2012-09-07 17:49 ` Konrad Rzeszutek Wilk
2012-09-13 2:28 ` Duan, Ronghui
2012-09-13 7:32 ` Jan Beulich
2012-09-13 11:05 ` Stefano Stabellini
2012-09-13 13:23 ` Konrad Rzeszutek Wilk
2012-09-13 14:05 ` Duan, Ronghui
2012-09-17 6:33 ` Duan, Ronghui
2012-09-17 14:37 ` Konrad Rzeszutek Wilk
2012-09-19 21:11 ` Konrad Rzeszutek Wilk [this message]
2012-09-13 13:21 ` Konrad Rzeszutek Wilk
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