Re: serious performance regression in .41

["J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost>]

On 22 May 2014, at 13:27, Christos Zoulas <christos%astron.com@localhost> wrote:

> In article <0E8BFCFC-C4CD-4CE3-8BAC-22EB8EBD3471%eis.cs.tu-bs.de@localhost>,
> J. Hannken-Illjes <hannken%eis.cs.tu-bs.de@localhost> wrote:
>> On 22 May 2014, at 03:15, Christos Zoulas <christos%astron.com@localhost> 
>> wrote:
<snip>
> 
>>> - start a build
>>> - hold a key down at the shell prompt and notice how it behaves
>>> 
>>> Every 3 or so lines (of 80 characters), you'll notice a large pause
>>> where the machine is unresponsive for a couple of seconds, and then
>> comes back.
>> 
>> I'm not able to reproduce this behaviour here.  Please describe
>> your setup (mounted file systems and build command) in more detail.
> 
> The build command is standard. I have raid over sd0 (SAS drives).
> How much memory do you have? Leave enough time for the buffer cache
> to fill up.

It is 16 CPU / 16 GB virtual machine on KVM/CentOS6.

The output of "mount" and the raid level could help, any tuning
with "sysctl"?

--
J. Hannken-Illjes - hannken%eis.cs.tu-bs.de@localhost - TU Braunschweig 
(Germany)