[DRBD-user] Slow synch rate with kernel 2.6.17

Milind Dumbare milind at linsyssoft.com
Thu Sep 21 09:28:20 CEST 2006

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


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?
> 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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