Performance impact of CONFIG_SCHED_MC? direct-io test case
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From: Dominik Brodowski on 5 Aug 2010 17:00 How large is the performance impact of CONFIG_SCHED_MC -- for which there is a warning that it comes "at a cost of slightly increased overhead in some places."? Well, for the test workload I've been working with lately, dd if=<device> of=/dev/zero bs=8k count=100000 iflag=direct where <device> is a dm-crypted LVM volume consisting of several partitions on a notebook pata harddisk, and all this runs on a Core2 Duo, I get a ~ 10 % performance reduction if CONFIG_SCHED_MC is enabled. Combined with the CONFIG_DEBUG performance reduction mentioned in the other message, all of the reduction from 28 MB/s to 18 MB/s is explained for. Best, Dominik PS: Ingo: you got both mingo(a)elte.hu and mingo(a)redhat.com in MAINTAINERS, I suppose both are valid? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |