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| author | alfred <alfred@FreeBSD.org> | 2012-11-10 02:08:40 +0000 |
|---|---|---|
| committer | alfred <alfred@FreeBSD.org> | 2012-11-10 02:08:40 +0000 |
| commit | 7beb738c8a72cc197d3e898784afe3fba28f1834 (patch) | |
| tree | 2d08cbee7278cd7eea9a43b81a23320e35210c05 /sys/kern/kern_mbuf.c | |
| parent | 8e1fdec2c76a948b16ebf8e4abe2cb73a60d3477 (diff) | |
| download | FreeBSD-src-7beb738c8a72cc197d3e898784afe3fba28f1834.zip FreeBSD-src-7beb738c8a72cc197d3e898784afe3fba28f1834.tar.gz | |
Allow maxusers to scale on machines with large address space.
Some hooks are added to clamp down maxusers and nmbclusters for
small address space systems.
VM_MAX_AUTOTUNE_MAXUSERS - the max maxusers that will be autotuned based on
physical memory.
VM_MAX_AUTOTUNE_NMBCLUSTERS - max nmbclusters based on physical memory.
These are set to the old values on i386 to preserve the clamping that was
being done to all arches.
Another macro VM_AUTOTUNE_NMBCLUSTERS is provided to allow an override
for the calculation on a MD basis. Currently no arch defines this.
Reviewed by: peter
MFC after: 2 weeks
Diffstat (limited to 'sys/kern/kern_mbuf.c')
| -rw-r--r-- | sys/kern/kern_mbuf.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/sys/kern/kern_mbuf.c b/sys/kern/kern_mbuf.c index de2998b..f8fd0d7 100644 --- a/sys/kern/kern_mbuf.c +++ b/sys/kern/kern_mbuf.c @@ -113,8 +113,17 @@ tunable_mbinit(void *dummy) /* This has to be done before VM init. */ TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters); - if (nmbclusters == 0) + if (nmbclusters == 0) { +#ifdef VM_AUTOTUNE_NMBCLUSTERS + nmbclusters = VM_AUTOTUNE_NMBCLUSTERS; +#else nmbclusters = 1024 + maxusers * 64; +#endif +#ifdef VM_MAX_AUTOTUNE_NMBCLUSTERS + if (nmbclusters > VM_MAX_AUTOTUNE_NMBCLUSTERS) + nmbclusters = VM_MAX_AUTOTUNE_NMBCLUSTERS; +#endif + } TUNABLE_INT_FETCH("kern.ipc.nmbjumbop", &nmbjumbop); if (nmbjumbop == 0) |
