Messages in this thread | | | Date | Sat, 9 Nov 2002 12:20:18 +0100 | From | Jens Axboe <> | Subject | Re: [BENCHMARK] 2.4.{18,19{-ck9},20rc1{-aa1}} with contest |
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On Fri, Nov 08 2002, Andrew Morton wrote: > Con Kolivas wrote: > > > > -----BEGIN PGP SIGNED MESSAGE----- > > Hash: SHA1 > > > > >Con Kolivas wrote: > > >> io_load: > > >> Kernel [runs] Time CPU% Loads LCPU% Ratio > > >> 2.4.18 [3] 474.1 15 36 10 6.64 > > >> 2.4.19 [3] 492.6 14 38 10 6.90 > > >> 2.4.19-ck9 [2] 140.6 49 5 5 1.97 > > >> 2.4.20-rc1 [2] 1142.2 6 90 10 16.00 > > >> 2.4.20-rc1aa1 [1] 1132.5 6 90 10 15.86 > > > > > >2.4.20-pre3 included some elevator changes. I assume they are the > > >cause of this. Those changes have propagated into Alan's and Andrea's > > >kernels. Hence they have significantly impacted the responsiveness > > >of all mainstream 2.4 kernels under heavy writes. > > > > > >(The -ck patch includes rmap14b which includes the read-latency2 thing) > > > > Thanks for the explanation. I should have said this was ck with compressed > > caching; not rmap. > > > > hrm. In that case I'll shut up with the speculating. > > You're showing a big shift in behaviour between 2.4.19 and 2.4.20-rc1. > Maybe it doesn't translate to worsened interactivity. Needs more > testing and anaysis.
The merging and seek accounting in 2.4.19 is completely off, it doesn't make any sense. 2.4.20-rc1 should be sanely tweakable.
-- Jens Axboe
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