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Re: [Linux-cluster] AW: GNBD multipath with devicemapper? -- possible solution



Hi

I did further tests and I am not sure if it is gnbd related.
I did some tests with local ext3 and local gfs filesystem
on rhel4 2.6.9-6.36 and 2.6.9-6.38 with current cvs (RHEL4 tag).
ext3 reads and writes 2000MB in about 13-14s on our new testhardware.
gfs writes it in about 15s and needs about 40 s for reading (even with lock_nolock filesystem)


Maybe you can try this on an local RHEL4 gfs filesystem to, in order to be sure,
that my initially gnbd problem did not lead you to the wrong direction and the problem is gfs related.


nice weekend from munich

hansjörg





Benjamin Marzinski wrote:

On Thu, Apr 21, 2005 at 07:58:49AM +0200, Hansjörg Maurer wrote:


Hi

thank you very much,
Do you have any idea what causes the speed difference between vanilla and RHEL4 kernel?
Should I officially file a bug in bugzilla, or do you take care of the problem?



Go ahead and file a bug on gnbd if you are interested in tracking the status of this. I'll put it on my list of things to do.

-Ben



Greetings


Hansjörg








I got those numbers on a vanilla 2.6.11 kernel.
Running on a 2.6.9-6.24.EL kernel, I get
45.6608 MB/sec writes 35.8578 MB/sec reads


Not as pronouced as your numbers, but a noticeable speed difference.

-Ben




Thank you very much

Hansjörg









--
_________________________________________________________________

Dr.  Hansjoerg Maurer           | LAN- & System-Manager
                            |
Deutsches Zentrum               | DLR Oberpfaffenhofen
f. Luft- und Raumfahrt e.V.   |
Institut f. Robotik             |
Postfach 1116                   | Muenchner Strasse 20
82230 Wessling                  | 82234 Wessling
Germany                         |
                            |
Tel: 08153/28-2431              | E-mail: Hansjoerg Maurer dlr de
Fax: 08153/28-1134              | WWW: http://www.robotic.dlr.de/
__________________________________________________________________


There are 10 types of people in this world, those who understand binary and those who don't.


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--
Linux-cluster mailing list
Linux-cluster redhat com
http://www.redhat.com/mailman/listinfo/linux-cluster





--
_________________________________________________________________

Dr.  Hansjoerg Maurer           | LAN- & System-Manager
                              |
Deutsches Zentrum               | DLR Oberpfaffenhofen
f. Luft- und Raumfahrt e.V.   |
Institut f. Robotik             |
Postfach 1116                   | Muenchner Strasse 20
82230 Wessling                  | 82234 Wessling
Germany                         |
                              |
Tel: 08153/28-2431              | E-mail: Hansjoerg Maurer dlr de
Fax: 08153/28-1134              | WWW: http://www.robotic.dlr.de/
__________________________________________________________________


There are 10 types of people in this world, those who understand binary and those who don't.


--
Linux-cluster mailing list
Linux-cluster redhat com
http://www.redhat.com/mailman/listinfo/linux-cluster



-- Linux-cluster mailing list Linux-cluster redhat com http://www.redhat.com/mailman/listinfo/linux-cluster





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