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

[Paul Kölle]

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