Messages in this thread | | | Subject | Re: Linux 2.6.6-rc3 | From | Craig Thomas <> | Date | Thu, 29 Apr 2004 08:59:40 -0700 |
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On Wed, 2004-04-28 at 19:11, Andrew Morton wrote: > Craig Thomas <craiger@osdl.org> wrote: > > > > I have taken a quick look at the results and I see no degredations > > from 2.6.6-rc2 and the performance looks much better than the > > 2.6.5 kernel for dbt3 (as reported earlier). > > The 70% dbt3 improvement is extremely fishy. Yes, there are things in > 2.6.6-rc3 which could improve database workloads by that much, but dbt3 > doesn't appear to be using them. > > Again, the vmstat traces indicate that after a run on 2.6.6-rc3 we have a > full gigabyte less used pagecache than with 2.6.5. In both cases there is > still a lot of free memory. Which tends to indicate that the -rc3 run was, > for some reason, not an equivalent workload - it's using a smaller dataset. > > I'd suggest that you double-check these results, try and work out why the > -rc3 run is touching less data. Maybe go back and redo the 2.6.5 test?
That's a good plan. We will do a re-run of 2.6.5 and get back to the list.
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