Date: Wed, 27 Mar 2013 10:52:18 +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: r248789 - head/sys/i386/include Message-ID: <201303271052.r2RAqIRm065774@svn.freebsd.org>
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Author: kib Date: Wed Mar 27 10:52:18 2013 New Revision: 248789 URL: http://svnweb.freebsd.org/changeset/base/248789 Log: Fix the VM_BCACHE_SIZE_MAX definition on i386 to match the maximal buffer map size, auto-tuned on the 4GB machine. Having the maxbcache bigger than the buffer map causes the transient bio map sizing logic to assume that there is enough KVA to use approximately 90MB (buffer map is sized to 110MB, and maxbcache is 200MB). The increase in the KVA usage caused other big KVA consumers, like nvidia.ko, to fail the initialization. Change the definition for both PAE and non-PAE cases, since PAE is even more KVA-starved. Reported and tested by: David Wolfskill Discussed with: alc Sponsored by: The FreeBSD Foundation Modified: head/sys/i386/include/param.h Modified: head/sys/i386/include/param.h ============================================================================== --- head/sys/i386/include/param.h Wed Mar 27 10:11:43 2013 (r248788) +++ head/sys/i386/include/param.h Wed Mar 27 10:52:18 2013 (r248789) @@ -140,9 +140,12 @@ * Ceiling on size of buffer cache (really only effects write queueing, * the VM page cache is not effected), can be changed via * the kern.maxbcache /boot/loader.conf variable. + * + * The value is equal to the size of the auto-tuned buffer map for + * the machine with 4GB of RAM, see vfs_bio.c:kern_vfs_bio_buffer_alloc(). */ #ifndef VM_BCACHE_SIZE_MAX -#define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024) +#define VM_BCACHE_SIZE_MAX (7224 * 16 * 1024) #endif /*
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