Andrea Arcangeli wrote, on 26/02/11 17:13: > On Thu, Feb 24, 2011 at 02:54:05AM +0100, Andrea Arcangeli wrote: >> Ok so tomorrow I'll get all results on these 3 kernels ( >> compaction-kswapd-3+compaction_alloc_lowlat-2 vs >> compaction-no-kswapd-3+compaction_alloc_lowlat-2 vs >> compaction_alloc_lowlat2) on network server load, where throughout is >> measured in addition to latency. Then we'll have a better picture to > > Latency is still lowest with compaction-no-kswapd-3. compaction_alloc > still is at the top of the profiling with > compaction-kswapd-3+compaction_alloc_lowlat-2. However > compaction-kswapd-3 reduced the overhead somewhat but not enough to be > as fast as with compaction-no-kswapd-3 (even if much better than > before). > > So we should apply compaction-no-kswapd-3 to 2.6.38 I think. I built a kernel based against git head of around 0800 UTC Saturday 2011-02-26 plus compaction-no-kswapd-3 (Andrea's) and compaction_alloc_lowlat-2 (Mel's) patches. The the latency performance for MIDI playback is excellent and kswap0 has reported 100 seconds of CPU time in 22 hours of the kernel kernel running. However, I am now battling against the kernel freeing up memory when using icedove/thunderbird. top is reporting 74 MiB resident, 418 MiB virtual, and as I pause typing to watch top output, free RAM has gone up to 50 MiB and I'm stuck waiting for parts of icedove to swap back in so that I can get a response from my input (either scrolling a message when reading it or composing a message, where I am left waiting for the text that I typed to appear). Normally in this machine with only 384 MiB RAM and (say) 2.6.35-2.6.37 kernels, free RAM will hover around the 5 MiB mark when lots of applications are open. I may wait when switching from one running application to another for it to respond, but once I am using that particular application it sufficiently responsive not to be annoying. The aggressive reclamation of RAM by the kernel I built around 0800 UTC Saturday is working against the application currently in focus. I will try Andrea's and Mel's patches built against 2.6.36-rc6 over the next several hours to see how that compares. Arthur. ------------------------------------------------------------------------------ Free Software Download: Index, Search & Analyze Logs and other IT data in Real-Time with Splunk. Collect, index and harness all the fast moving IT data generated by your applications, servers and devices whether physical, virtual or in the cloud. Deliver compliance at lower cost and gain new business insights. http://p.sf.net/sfu/splunk-dev2dev _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
