From: | Justin Pryzby <justinp(at)norchemlab(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | dump time increase by 1h with new kernel |
Date: | 2009-09-27 23:57:56 |
Message-ID: | 20090927235756.GA31422@norchemlab.com |
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Lists: | pgsql-general |
When we upgraded from linux-2.6.24 to ./linux-2.6.27, our pg_dump
duration increased by 20%. My first attempt at resolution was to boot
with elevator=deadline. However that's actually the default IO
scheduler in both kernels.
The two dmesg's are at:
https://www.norchemlab.com/tmp/linux-2.6.24-22.45-server
https://www.norchemlab.com/tmp/linux-2.6.27-14.41-server
The database partition is: xfs / lvm / aic79xx / scsi.
Booting back into the .24 kernel brings the pg_dump down to 5 hours
(rather than 6, for daily 20GB output compressed by pg_dump -Fc).
Does anyone know what might be different which could cause such a
drastic change?
Thanks,
Justin
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