Re: Sequential disk IO saturates system

2010-09-14 Thread Wiktor Niesiobedzki
Hi, You may try to play with kern.sched.preempt_thresh setting (as per http://docs.freebsd.org/cgi/getmsg.cgi?fetch=665455+0+archive/2010/freebsd-stable/20100905.freebsd-stable). Renice'ing the process doesn't give any improvement, as this is g_eli* thread that is consuming your CPU, which has p

Sequential disk IO saturates system

2010-09-14 Thread grarpamp
We have [re]nice to deal with user processes. Is there no way to effectively rate limit the disk pipe? As it is now, this machine can't do any userland work because it's completely buried by the simple degenerate case of: cp /fs_a/.../giga_size_files /fs_b/... Geli and zfs are in use, yet that d