Re: SCHEDULE and high load situations

From: Martin Blapp <mb_at_imp.ch>
Date: Wed, 11 Aug 2004 18:20:17 +0200 (CEST)
Hi,

> I've found that for throughput oriented workloads, 4BSD substantially
> outperforms ULE, but I haven't tried it with Jeff's latest set of patches
> (committed a day or two ago).  You don't mention if your box is SMP, btw
> -- I've noticed some load balancing problems with ULE previously, but
> haven't checked if they were resolved.  Anecdotal opinion seems generally
> to be that interactivity is observably better with ULE than 4BSD, but that
> 4BSD appears to do a better job under load.

If the load doesn't grow over 2, I'd say the scheduler is broken. This is SMP
btw.

> SMP.  Some of the wins on SMP have been from moving to adaptive mutexes by
> default (most recently, for Giant on i386); others from improved fine
> grain locking in VM and networking, and general optimization of
> synchronization primitives, scheduling, wakeups/locking, etc.

The tests I've done are with your adaptive giant option and Jeff's ULE patches.

Martin
Received on Wed Aug 11 2004 - 14:20:28 UTC

This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:38:05 UTC