Date: Mon, 3 Jun 2013 04:16:48 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r251282 - head/sys/kern Message-ID: <201306030416.r534GmCA001872@svn.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: kib Date: Mon Jun 3 04:16:48 2013 New Revision: 251282 URL: http://svnweb.freebsd.org/changeset/base/251282 Log: When auto-sizing the buffer cache, limit the amount of physical memory used as the estimation of size, to 32GB. This provides around 100K of buffer headers and corresponding KVA for buffer map at the peak. Sizing the cache larger is not useful, also resulting in the wasting and exhausting of KVA for large machines. Reported and tested by: bdrewery Sponsored by: The FreeBSD Foundation Modified: head/sys/kern/vfs_bio.c Modified: head/sys/kern/vfs_bio.c ============================================================================== --- head/sys/kern/vfs_bio.c Mon Jun 3 04:11:42 2013 (r251281) +++ head/sys/kern/vfs_bio.c Mon Jun 3 04:16:48 2013 (r251282) @@ -560,7 +560,8 @@ kern_vfs_bio_buffer_alloc(caddr_t v, lon nbuf += min((physmem_est - 4096) / factor, 65536 / factor); if (physmem_est > 65536) - nbuf += (physmem_est - 65536) * 2 / (factor * 5); + nbuf += min((physmem_est - 65536) * 2 / (factor * 5), + 32 * 1024 * 1024 / (factor * 5)); if (maxbcache && nbuf > maxbcache / BKVASIZE) nbuf = maxbcache / BKVASIZE;
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201306030416.r534GmCA001872>