Timo Sirainen put forth on 12/9/2010 7:10 PM: > On 10.12.2010, at 0.54, Stan Hoeppner wrote: > >> However, this still doesn't seem to explain Ralf's issue, where the >> kernel stays the same, but the Dovecot version changes, with 2.0.x >> causing the high load and 1.2.x being normal. Maybe 2.0.x simply causes >> this bug to manifest itself more loudly? > > Cor's debugging has so far shown that a single epoll_wait() call can > sometimes generate a few thousand voluntary context switches. I can't really > understand how that's possible. Those epoll_wait() calls about half of the > total voluntary context switches generated by imap processes. We'll see > tomorrow if poll() works better or if a small patch I made makes it better. > >> This Linux kernel bug doesn't explain the high load reported with 2.0.x >> on FreeBSD either. > > Who has reported high load on FreeBSD? So far I know of only Ralf and Cor and > both are using Linux.
Oh, my bad Timo. I thought someone said they were running Dovecot 2.0.x atop FreeBSD on bare metal and having the high load issue. I must have got two different posts crossed up in the gray matter. -- Stan
