* [blkfront] max_segments & max_segment_size
@ 2013-02-09 17:44 Olivier Bonvalet
2013-02-15 15:42 ` Konrad Rzeszutek Wilk
0 siblings, 1 reply; 2+ messages in thread
From: Olivier Bonvalet @ 2013-02-09 17:44 UTC (permalink / raw)
To: xen-devel@lists.xen.org
Hi,
I have (very) poor write performance with Xen PV, used over RBD, and I
suppose it's because of very short values for max_segments and
max_segment_size.
(I have 250MB/s write speed in Dom0 vs 40MB/s write speed in DomU)
>From what I read, there is already a patch to fix that, called "multi
page ring support for block devices" :
http://lists.xen.org/archives/html/xen-devel/2012-03/msg00388.html
But it doesn't seem to have been accepted.
So, does it exist an other solution to fix that kind of problem ?
Thanks,
Olivier
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [blkfront] max_segments & max_segment_size
2013-02-09 17:44 [blkfront] max_segments & max_segment_size Olivier Bonvalet
@ 2013-02-15 15:42 ` Konrad Rzeszutek Wilk
0 siblings, 0 replies; 2+ messages in thread
From: Konrad Rzeszutek Wilk @ 2013-02-15 15:42 UTC (permalink / raw)
To: Olivier Bonvalet; +Cc: xen-devel@lists.xen.org
On Sat, Feb 09, 2013 at 06:44:22PM +0100, Olivier Bonvalet wrote:
> Hi,
>
> I have (very) poor write performance with Xen PV, used over RBD, and I
> suppose it's because of very short values for max_segments and
> max_segment_size.
> (I have 250MB/s write speed in Dom0 vs 40MB/s write speed in DomU)
>
> >From what I read, there is already a patch to fix that, called "multi
> page ring support for block devices" :
> http://lists.xen.org/archives/html/xen-devel/2012-03/msg00388.html
>
> But it doesn't seem to have been accepted.
>
> So, does it exist an other solution to fix that kind of problem ?
They are in development.
>
> Thanks,
> Olivier
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2013-02-09 17:44 [blkfront] max_segments & max_segment_size Olivier Bonvalet
2013-02-15 15:42 ` Konrad Rzeszutek Wilk
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