[DRBD-user] Slow synch rate with kernel 2.6.17

[Bernhard Limbach]

-------- Original-Nachricht --------
Datum: Thu, 21 Sep 2006 12:58:20 +0530
Von: Milind Dumbare <milind at linsyssoft.com>
An: Bernhard Limbach <bernhard.limbach at gmx.de>
Betreff: Re: [DRBD-user] Slow synch rate with kernel 2.6.17

> On Wed, 2006-09-20 at 19:25 +0200, Bernhard Limbach wrote:
> > Hi list,
> > 
> > We observe that the sync-rate is extremly slow with kernel 2.6.17.
> > 
> Did you check "hdparm -t <underlying volume name>" is it slow?


Does not show anything suspicious.

Thanks,
Bernhard


> > Platform:
> > 
> > - 2x HP-Proliant DL-380 G4
> > drbd-connection over Gigabit crossover (using bonding-interface)
> > 
> > - Fedora Core 5
> > 
> > - same observation for both drbd-0.7.20 and drbd-0.7.21, compiled from
> tgz. 
> > 
> > 
> > With kernel 2.6.16_1.2133_FC5smp, everything was fine. Just when
> changing the kernel to 2.6.17-1.2174_FC5smp, the synch rate is extremly low (about
> one to two MByte/s). The network connection is still fast (e.g. copying a
> large file via scp).
> > 
> > Using the non-smp-kernel does not make a difference.
> > 
> > We did not touch the drbd-configuration when changing the kernels, we
> just added the appropriate kernel-modul for drbd. The kernels we use are
> those provided by Fedora.
> > 
> > It's reproducable, just rebooting with the old kernel gives the correct
> performance. Unfortunately we need a more recent kernel than 2.6.16 :(
> > 
> > Did anyone observe something similar ??
> > 
> > Thanks for any advice and best regards,
> > Bernhard
> -- 
> Milind
> "The world is divided into one group: those who start counting at 0,
> and those who don't."

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