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When auto-sizing the buffer cache, limit the amount of physical memory

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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
This commit is contained in:
Konstantin Belousov 2013-06-03 04:16:48 +00:00
parent aed1e745d0
commit 92fab43f7f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=251282
1 changed files with 2 additions and 1 deletions
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sys/kern/vfs_bio.c
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@ -560,7 +560,8 @@ kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est)
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;