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Wed, 01 Oct 2008
Tbench regression. SLAB vs SLUB.
After I found
a small fix for tbench regression over loopback, I decided to run some tests with it.
As was expected, turning off TSO/GSO does not fix the whole issue, performance was increased from 366 MB/s upto 381 MB/s, which is still less than 398 MB/s for 2.6.26-slub.
Another interesting issue I found, is SLAB vs SLUB difference. The former is always faster (about 5-7 MB/s difference): 366 vs 361 MB/s for 2.6.27-rc7 and 381 vs 374 MB/s when TSO and GSO are turned off. Pekka Enberg suggested to revert 5595cffc8248e4672c5803547445e85e4053c8fc commit, which could result in this performance degradation, but without this commit SLUB behaves a little bit slower: 372 vs 374 MB/s.
I will try to find out why there is a huge drop between 2.6.23 and 2.6.24 (54 MB/s) next.
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