Messages in this thread | | | Date | Mon, 17 Mar 2008 20:27:14 +0100 | From | Jens Axboe <> | Subject | Re: [PATCH (block.git) 0/2] IO CPU affinity update: |
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On Mon, Mar 17 2008, Alan D. Brunelle wrote: > Hi Jens - > > Two patches: > > 1. Adds in the IRQ saving to generic_smp_call_function_single_interrupt (as you had suggested). > 2. Ensures a single IPI generated to get a remote function call handler going. > > So far it is working better than before on the 4-way IA64 w/ the mkfs/untar/make test suite - after 22 runs: > > Part RQ MIN AVG MAX Dev > ----- -- ------ ------ ------ ------ > mkfs 0 18.786 19.253 19.655 0.241 > mkfs 1 18.639 19.182 19.786 0.293 > > untar 0 17.140 17.486 18.250 0.322 > untar 1 16.951 17.494 18.274 0.350 > > make 0 22.927 24.310 34.339 2.287 > make 1 22.863 23.788 24.189 0.333 > > comb 0 59.478 61.049 70.320 2.142 > comb 1 59.875 60.463 61.305 0.458 > > psys 0 3.96% 4.14% 4.39% 0.100 > psys 1 3.60% 3.85% 4.19% 0.176 > > So we're seeing reduced time (~1.0%) and reduced %sys to do it (7.0%). > The tighter deviations for make with rq=1 may be interesting... :-) > > I've compiled & booted the patches for x86_64 - rq=1 is working on > that platform too.
This is starting to look pretty good! Thanks a lot for these results, and the ->activated optimizations. I had a feeling the unstable results were something like this, missing ipi's.
-- Jens Axboe
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