Messages in this thread |  | | Date | Tue, 16 Jan 2001 14:43:01 +0800 | | From | "Vlad Bolkhovitine" <> | | Subject | Re: mmap()/VM problems in 2.4.0 |
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Mike Galbraith wrote: > > On 15 Jan 2001, Zlatko Calusic wrote: > > > "Vlad Bolkhovitine" <vladb@sw.com.sg> writes: > > > > > Here is updated info for 2.4.1pre3: > > > > > > Size is MB, BlkSz is Bytes, Read, Write, and Seeks are MB/sec > > > > > > with mmap() > > > > > > File Block Num Seq Read Rand Read Seq Write Rand Write > > > Dir Size Size Thr Rate (CPU%) Rate (CPU%) Rate (CPU%) Rate (CPU%) > > > ------- ------ ------- --- ----------- ----------- ----------- ----------- > > > . 1024 4096 2 1.089 1.24% 0.235 0.45% 1.118 4.11% 0.616 1.41% > > > [...] > > > Mmap() performance dropped dramatically down to almost unusable level. Plus, > > > system was unusable during test: "vmstat 1" updated results every 1-2 _MINUTES_! > > > > > > > You need Marcelo's patch. Please apply and retest. > > My box thinks quite highly of that patch fwiw, but insists that he needs > to apply Jens Axboes' blk patch first ;-) (Not because of tiobench)
New data:
2.4.1pre3 + Marcelo's patch
File Block Num Seq Read Rand Read Seq Write Rand Write Dir Size Size Thr Rate (CPU%) Rate (CPU%) Rate (CPU%) Rate (CPU%) ------- ------ ------- --- ----------- ----------- ----------- ----------- . 1024 4096 2 12.68 9.23% 0.497 0.92% 10.57 15.3% 0.594 1.44%
The same performance level as for 2.4.0. No improvement.
2.4.1pre3 + Marcelo's patch + Jens Axboes' blk-13B patch
File Block Num Seq Read Rand Read Seq Write Rand Write Dir Size Size Thr Rate (CPU%) Rate (CPU%) Rate (CPU%) Rate (CPU%) ------- ------ ------- --- ----------- ----------- ----------- ----------- . 1024 4096 2 12.47 10.0% 0.504 1.13% 9.998 16.5% 0.735 2.21%
No significant difference, just noise. IMHO, it is expected, since 2 threads simply aren't enough to launch blk patch's mechanisms
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