[lkml]   [2014]   [Sep]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] virtio_blk: merge S/G list entries by default
On Sun, Sep 07, 2014 at 02:41:53PM +0300, Michael S. Tsirkin wrote:
> > Signed-off-by: Christoph Hellwig <>
> OK so this is an optimization patch right?
> What kind of performance gain is observed with it?

None. I actually wrote it when the block layer had a bug when dm was
used on top of the !merge case, and I decided to send it out as there had been
no discussion about disabling this by default on the existing blk-mq

At least for my qemu/kvm setup it doesn't make a difference either way,
although not doing the cheap merge doesn't like the right kind of optimization
to me.

 \ /
  Last update: 2014-09-07 21:01    [W:0.083 / U:3.600 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site