Date: Sat, 22 Oct 2011 13:28:17 +0300 From: Ivan Klymenko <fidaj@ukr.net> To: freebsd-current@freebsd.org Subject: Increase the degree of interactivity ULE scheduler Message-ID: <20111022132817.35db5ccd@nonamehost.>
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Hello people!
I have:
CPU: Intel(R) Core(TM)2 Duo CPU T7250 @ 2.00GHz (1994.48-MHz K8-class CPU)
FreeBSD 10.0-CURRENT r226607 amd64
For example during the building of the port lang/gcc46 in four streams (-j 4) with a heavy load on the processor - use the system was nearly impossible - responsiveness was terrible - the mouse cursor sometimes froze on the spot a few seconds...
I managed to achieve a significant increase in the degree of interactivity ULE scheduler due to the following changes:
##########################
--- sched_ule.c.orig 2011-10-22 11:40:30.000000000 +0300
+++ sched_ule.c 2011-10-22 12:25:05.000000000 +0300
@@ -2119,6 +2119,14 @@
THREAD_LOCK_ASSERT(td, MA_OWNED);
tdq = TDQ_SELF();
+ if (td->td_pri_class & PRI_FIFO_BIT)
+ return;
+ ts = td->td_sched;
+ /*
+ * We used up one time slice.
+ */
+ if (--ts->ts_slice > 0)
+ return;
#ifdef SMP
/*
* We run the long term load balancer infrequently on the first cpu.
@@ -2144,9 +2152,6 @@
if (TAILQ_EMPTY(&tdq->tdq_timeshare.rq_queues[tdq->tdq_ridx]))
tdq->tdq_ridx = tdq->tdq_idx;
}
- ts = td->td_sched;
- if (td->td_pri_class & PRI_FIFO_BIT)
- return;
if (PRI_BASE(td->td_pri_class) == PRI_TIMESHARE) {
/*
* We used a tick; charge it to the thread so
@@ -2157,11 +2162,6 @@
sched_priority(td);
}
/*
- * We used up one time slice.
- */
- if (--ts->ts_slice > 0)
- return;
- /*
* We're out of time, force a requeue at userret().
*/
ts->ts_slice = sched_slice;
##########################
What do you think about this?
Thanks!
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