Messages in this thread | | | Date | Thu, 23 Feb 2012 17:48:25 +0530 | From | Srivatsa Vaddagiri <> | Subject | Re: sched: Avoid SMT siblings in select_idle_sibling() if possible |
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* Ingo Molnar <mingo@elte.hu> [2012-02-23 12:19:29]:
> sysbench is one of the best ones punishing bad scheduler > balancing mistakes.
Here are the sysbench oltp score on same machine i.e:
Machine : 2 Quad-core Intel X5570 CPU (H/T enabled) Kernel : tip (HEAD at 6241cc8) sysbench : 0.4.12
sysbench was run with 16 threads as:
./sysbench --num-threads=16 --max-requests=100000 --test=oltp --oltp-table-size=500000 --mysql-socket=/var/lib/mysql/mysql.sock --oltp-read-only --mysql-user=root --mysql-password=blah run
sysbench was run 5 times with fs-cache being purged before each run (echo 3 > /proc/sys/vm/drop_caches).
Average of 5 runs alongwith % std. dev. is noted for various OLTP stats
SD_BALANCE_WAKE SD_BALANCE_WAKE disabled enabled
transactions (per sec) 4833.826 (+- 0.75%) 4837.354 (+- 1%) read/write requests (per sec) 67673.580 (+- 0.75%) 67722.960 (+- 1%) other ops (per sec) 9667.654 (+- 0.75%) 9674.710 (+- 1%)
There is minor improvement seen when SD_BALANCE_WAKE is enabled at SMT/MC domains, but no degradation observed with it enabled.
- vatsa
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