Messages in this thread | | | Date | Fri, 10 Oct 2008 12:09:10 +0400 | From | Evgeniy Polyakov <> | Subject | Re: [tbench regression fixes]: digging out smelly deadmen. |
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Hi Peter.
I've enabled kernel hacking option and scheduler debugging and turned off hrticks and performance jumped to 382 MB/s:
vanilla 27: 347.222 no TSO/GSO: 357.331 no hrticks: 382.983
I use tsc clocksource, also available acpi_pm and jiffies, with acpi_pm performance is even lower (I stopped test after it dropped below 340 MB/s mark), jiffies do not work at all, looks like sockets stuck in time_wait state when this clock source is used, although that may be some different issue.
So I think hrticks are guilty, but still not as good as .25 tree without mentioned changes (455 MB/s) and .24 (475 MB/s).
-- Evgeniy Polyakov
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