Date: Fri, 1 Mar 2013 15:09:24 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-projects@freebsd.org Subject: svn commit: r247549 - projects/calloutng/sys/kern Message-ID: <201303011509.r21F9O4E081093@svn.freebsd.org>
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Author: mav Date: Fri Mar 1 15:09:23 2013 New Revision: 247549 URL: http://svnweb.freebsd.org/changeset/base/247549 Log: Change CC_HASH_SHIFT from 10 to 8, changing callwheel bucket size from 1ms to 4ms. This allows to reduce time consumed by callout_process() on linear travense through the array of empty buckets on systems with few callouts. On systems with many callouts result depends on callouts time and precision: smaller CC_HASH_SHIFT value improves handling of long callouts, while bigger value improves handling of short and precise (not aggregable) ones. Modified: projects/calloutng/sys/kern/kern_timeout.c Modified: projects/calloutng/sys/kern/kern_timeout.c ============================================================================== --- projects/calloutng/sys/kern/kern_timeout.c Fri Mar 1 14:54:37 2013 (r247548) +++ projects/calloutng/sys/kern/kern_timeout.c Fri Mar 1 15:09:23 2013 (r247549) @@ -367,7 +367,7 @@ start_softclock(void *dummy) SYSINIT(start_softclock, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softclock, NULL); -#define CC_HASH_SHIFT 10 +#define CC_HASH_SHIFT 8 static inline u_int callout_hash(sbintime_t sbt)
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