Re: 2.4.21 opteron 32 Gig RAM has 10k block writes/sec on running posgresql 7.4.6 disk i/o intensive app

[William Lee Irwin III]

On Thu, Dec 23, 2004 at 12:26:48PM +0530, Paramveer Singh wrote:
> we are using a RedHat AS3 U3 box (2.4.21-4.ELsmp) to run a very
> intensive database app which does a _huge_ number of inserts durnig
> the data generation phase. However, we are noticing a unexpected
> performance drops with user cpu utilization numbers falling to near 0.
> most of the cpu is used up in iowait. 
> CPU states:  cpu    user    nice  system    irq  softirq  iowait    idle
>           total    2.0%    0.0%    7.6%   0.0%     0.0%  362.4%   27.2%
> /proc/slabinfo showed huge numbers in buffer_head. The line was:
> buffer_head       4908452 4962249    200 260854 261171    1 : 16000 4000

Please try to reproduce on a more recent RHEL3, e.g. RHEL3-U4 released
today.


-- wli
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