Messages in this thread | | | Subject | Re: 2.6.0-test2-mm3 osdl-aim-7 regression | Date | Fri, 08 Aug 2003 13:58:31 -0700 | From | Cliff White <> |
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> On Thu, 7 Aug 2003 05:10, Cliff White wrote: > > > Binary searching (insert gratuitous rant about benchmarks that take more > > > than two minutes to complete) reveals that the slowdown is due to > > > sched-2.6.0-test2-mm2-A3. > > This is most likely the round robinning of tasks every 25ms. The extra > overhead of nanosecond timing I doubt could make that size difference (but I > could be wrong). There is some tweaking of this round robinning in my code > which may help this, but it won't bring it back up to original performance I > believe. Two things to try are add my patches up to O12.3int first to see how > much (if at all!) it helps, and change TIMESLICE_GRANULARITY in sched.c to > (MAX_TIMESLICE) which basically disables it completely. If there is still a > drop in performance with this, the remainder is the extra locking/overhead in > nanosecond timing. > > Con > Added your patches to PLM, from your web site. We've had other issues slowing up the 4-cpu queue, but the two CPU tests ran. On these smaller platforms, not seeing big difference between the patches.
STP id PLM# Kernel Name Workfile MaxJPM MaxUser Host %Change 277231 2042 CK-O13-O13.1int-1 new_dbase 1333.60 22 stp2-002 0.00 277230 2041 CK-O12.3-O13int-1 new_dbase 1344.23 24 stp2-003 0.80 277228 2040 CK-012.2-O12.3int-1 new_dbase 1328.86 22 stp2-002 -0.36 All are a bit better than stock: 276572 2020 linux-2.6.0-test2 new_dbase 1320.68 22 stp2-000 -0.96 ---- Code location: bk://developer.osdl.org/osdl-aim-7 More results: http://developer.osdl.org/cliffw/reaim/index.html
Run parameters:
./reaim -s2 -x -t -i2 -f workfile.new_dbase -r3 -b -l./stp.config
cliffw
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