Matthew Wilcox wrote:
This is rather interesting. Since Christoph refuses to, here's my results with 8f40f67, first with slab: Now, change the config to slub:
[snip]
and we get slightly better results: willy@piggy:~$ sudo ./io-gen -d /dev/sda -j4 CPU 0 completed 1000000 ops in 45.848 seconds; 21811 ops per second CPU 2 completed 1000000 ops in 50.789 seconds; 19689 ops per second CPU 3 completed 1000000 ops in 55.876 seconds; 17896 ops per second CPU 1 completed 1000000 ops in 56.941 seconds; 17562 ops per second willy@piggy:~$ sudo taskset -p 1 1001 pid 1001's current affinity mask: f pid 1001's new affinity mask: 1 willy@piggy:~$ sudo ./io-gen -d /dev/sda -j4 CPU 2 completed 1000000 ops in 45.713 seconds; 21875 ops per second CPU 0 completed 1000000 ops in 47.020 seconds; 21267 ops per second CPU 3 completed 1000000 ops in 58.692 seconds; 17038 ops per second CPU 1 completed 1000000 ops in 60.389 seconds; 16559 ops per second
Slabinfo -A -r before and after the run would be nice (you CONFIG_SLUB_STATS and Documentation/vm/slabinfo.c for the latter). A separate oprofile would be nice as well. Thanks!
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