Re: [Xen-devel] [RFC v1 0/5] VBD: enlarge max segment per request in blkfront

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Sep 13, 2012 at 02:28:12AM +0000, Duan, Ronghui wrote:
> > form xentop.
> > > Read 1K random    IOPS       Dom0 CPU     DomU CPU%
> > >           W       52005.9 86.6    71
> > >           W/O     52123.1 85.8    66.9
> > 
> > So I am getting some different numbers. I tried a simple 4K read:
> > 
> > [/dev/xvda1]
> > bssplit=4K
> > rw=read
> > direct=1
> > size=4g
> > ioengine=libaio
> > iodepth=64
> > 
> > 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
> > 
> What type of backend file you are using? In order to remove the influence of 
> cache in Dom0, I use a physical partition as backend.
> In code level, although there is some overhead in my patch compared to 
> original, but it should not to be so big. :)

Right :-)

phy:/dev/sda,xvda,w

The sda is a Corsair SSD.

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