| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Justin Pryzby <justinp(at)norchemlab(dot)com> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: dump time increase by 1h with new kernel |
| Date: | 2009-10-03 02:35:41 |
| Message-ID: | 20957.1254537341@sss.pgh.pa.us |
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| Lists: | pgsql-performance |
Justin Pryzby <justinp(at)norchemlab(dot)com> writes:
> When we upgraded from linux-2.6.24 to linux-2.6.27, our pg_dump
> duration increased by 20% from 5 hours to 6.
Wouldn't be the first time the kernel guys broke something :-(
I think a complaint to your kernel supplier is in order.
In a coincidence, the first item in the changelog for this week's
Fedora kernel update is:
* Fri Sep 25 2009 Chuck Ebbert <cebbert(at)redhat(dot)com> 2.6.30.8-64
- Fix serious CFQ performance regression.
This is surely not the exact same issue you are seeing, but it does
illustrate that performance regressions in the kernel aren't
unheard-of.
regards, tom lane
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