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Make kern.nswbuf tunable from loader.

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MFC after:	1 week
This commit is contained in:
Jung-uk Kim 2014-10-07 20:13:47 +00:00
parent 7ebeea9aa6
commit 37417245bf
1 changed files with 6 additions and 3 deletions
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9
sys/kern/vfs_bio.c
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@ -667,6 +667,10 @@ bd_speedup(void)
mtx_unlock(&bdlock);
}
#ifndef NSWBUF_MIN
#define NSWBUF_MIN 16
#endif
#ifdef __i386__
#define TRANSIENT_DENOM 5
#else
@ -778,11 +782,10 @@ kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est)
* swbufs are used as temporary holders for I/O, such as paging I/O.
* We have no less then 16 and no more then 256.
*/
nswbuf = max(min(nbuf/4, 256), 16);
#ifdef NSWBUF_MIN
nswbuf = min(nbuf / 4, 256);
TUNABLE_INT_FETCH("kern.nswbuf", &nswbuf);
if (nswbuf < NSWBUF_MIN)
nswbuf = NSWBUF_MIN;
#endif
/*
* Reserve space for the buffer cache buffers