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@xxxxxxx and mingo@xxxxxxxxxx in MAINTAINERS, I suppose both are valid? -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
