[DRBD-user] DRBD/8.3.6 with O_SYNC, write performance and latency issues.

Norman Sardella sardella at comcast.net
Fri Jan 22 02:36:09 CET 2010

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

On 1/21/2010 8:23 PM, Christian Balzer wrote:
> Hello,
> On Thu, 21 Jan 2010 16:18:01 -0500 Norman Sardella wrote:
>> I was able to address my performance/latency issues
>> by putting drbd/network/disk interrupts on the same CPU.
> This is very interesting, what kind of CPUs are you using and did
> you limit that to one core or multiple cores on one CPU?
> I would expect the penalty for multiple cores on the same Opteron CPU
> to be less than the 70us you saw, but I am no AMD CPU designer. ^.^
This was on Nehlahem with 1 CPU on 2nd core.

> My fear of doing something like this would be to run out of steam
> on that core when things get busy.
I have nothing else going on in the system, just doing
some path finding at the moment to see where the overhead is.

> Regards,
> Christian

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