Messages in this thread | | | Subject | Re: 2.6.4-mm2 | From | Chris Mason <> | Date | Thu, 18 Mar 2004 14:10:35 -0500 |
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On Thu, 2004-03-18 at 13:48, markw@osdl.org wrote: > On 18 Mar, Andrew Morton wrote: > > markw@osdl.org wrote: > >> > >> Sorry I'm falling behind... I see about a 10% decrease in throughput > >> with our dbt2 workload when comparing 2.6.4-mm2 to 2.6.3. I'm wondering > >> if this might be a result of the changes to the pagecache, radix-tree > >> and writeback code since you mentioned it could affect i/o scheduling in > >> 2.6.4-mm1. > > > > Could be. Have you run tests without LVM in the picture? > > No I haven't and I'm hesitant to. I have 52 single drives in one volume > and 14 single drives the other. Because it's PostgreSQL, my options are > to either run on a single drive (and not be able to drive the system as > hard) or to reconfigure my drives using hardware raid. I could do the > latter if you think it'll help. It's just a bit time consuming. > It might be more valuable to retest on 2.6.5-rc1-mm2. I'm assuming postgres was doing synchronous writes, and 2.6.4-mm2 doesn't really wait correctly.
-chris
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