Il giorno 04/giu/2014, alle ore 13:59, Takashi Iwai <tiwai@xxxxxxx> ha scritto: > […] > I've been using BFQ for a while and noticed also some obvious > regression in some operations, notably git, too. > For example, git grep regresses badly. > > I ran "test git grep foo > /dev/null" on linux kernel repos on both > rotational disk and SSD. > […] > > BFQ seems behaving bad when reading many small files. > The fix I described in my last reply to Pavel's speed tests (https://lkml.org/lkml/2014/6/4/94) apparently solves also this problem. As I wrote in that reply, the new fixed version of bfq is here: http://algogroup.unimore.it/people/paolo/disk_sched/debugging-patches/3.16.0-rc0-v7rc5.tgz These are our results, for your test, with this fixed version of bfq. time git grep foo > /dev/null Rotational disk: CFQ: 2.86user 4.87system 0:29.51elapsed 26%CPU 2.87user 4.87system 0:30.30elapsed 25%CPU 2.82user 4.90system 0:29.13elapsed 26%CPU BFQ: 2.81user 4.97system 0:25.96elapsed 29%CPU 2.83user 5.02system 0:24.79elapsed 31%CPU 2.85user 4.95system 0:24.73elapsed 31%CPU SSD: CFQ: 2.04user 3.93system 0:03.88elapsed 153%CPU 2.12user 3.85system 0:03.89elapsed 153%CPU 2.05user 3.92system 0:03.89elapsed 153%CPU BFQ: 2.10user 3.86system 0:03.89elapsed 153%CPU 2.05user 3.90system 0:03.88elapsed 153%CPU 2.01user 3.95system 0:03.89elapsed 153%CPU time git grep foo HEAD > /dev/null SSD: CFQ: 5.11user 0.38system 0:06.71elapsed 81%CPU 5.21user 0.36system 0:06.78elapsed 82%CPU 5.05user 0.41system 0:06.69elapsed 81%CPU BFQ: 5.17user 0.39system 0:06.77elapsed 82%CPU 5.13user 0.37system 0:06.73elapsed 81%CPU 5.17user 0.37system 0:06.78elapsed 81%CPU Should you be willing to provide further feedback on this and other tests, we would of course really appreciate it. Thanks again for your report, Paolo _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/containers
