[Gluster-users] Strange performance issues on Debian/Lenny compared to Ubuntu

[Raghavendra G]

Hi Paul,

* Can you test dd performance with only write-behind translator (along with
protocol/client) in client volume configuration?
* Also can you add "debug/trace" translator above and below write-behind,
start glusterfs with Log-level trace and send the log files?

regards,
On Sat, Mar 27, 2010 at 5:01 PM, Paul Kölle <pkoelle at gmail.com> wrote:

> On Fri, Mar 26, 2010 at 7:35 PM, Vikas Gorur <vikas at gluster.com> wrote:
> >
> > On Mar 26, 2010, at 4:48 AM, Olivier Le Cam wrote:
> >
> >> Ooops, I have cc the wrong command on the Ubuntu server. Please correct:
> >>
> >> > ubuntu:# dd if=/gl_nunki/file_test of=/dev/null
> >> > 524288+0 records in
> >> > 524288+0 records out
> >> > 268435456 bytes (268 MB) copied, 3,15924 s, 85,0 MB/s
> >>
> >> with:
> >>
> >> # dd if=/dev/zero of=/mnt/file_test count=262144 bs=1024
> >> 262144+0 records in
> >> 262144+0 records out
> >> 268435456 bytes (268 MB) copied, 5,56942 s, 48,2 MB/s
> >
> >
> > Please try both these commands with the same block size. Also, be aware
> > that GlusterFS performance goes down as the block size decreases.
>
> Hmm, if I read this right, there is no difference in blocksize:
>
> (Olivier) Ubuntu (corrected):
> # dd if=/dev/zero of=/mnt/file_test count=262144 bs=1024
> 262144+0 records in
> 262144+0 records out
> 268435456 bytes (268 MB) copied, 5,56942 s, 48,2 MB/s
>
> (Olivier) Lenny:
> lenny:# dd if=/dev/zero of=/mnt/file_test count=262144 bs=1024
> 262144+0 enregistrements lus
> 262144+0 enregistrements écrits
> 268435456 bytes (268 MB) copied, 82,408 s, 3,3 MB/s
>
> (mine) Lenny, 3.0.2:
> # dd if=/dev/zero of=/tmp/gluster_mount/file_test count=262144 bs=1024
> 262144+0 records in
> 262144+0 records out
> 268435456 bytes (268 MB) copied, 6.54638 s, 41.0 MB/s
>
> Im still on kernel 2.6.18 though...
>
> cheers
>  Paul
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-- 
Raghavendra G