Author: jkim
Date: Wed Oct 15 19:46:49 2014
New Revision: 273148
URL: https://svnweb.freebsd.org/changeset/base/273148
Log:
Make kern.nswbuf tunable from loader.
Modified:
stable/9/sys/kern/vfs_bio.c
Directory Properties:
stable/9/sys/ (props changed)
Modified: stable/9/sys/kern/vfs_bio.c
==============================================================================
--- stable/9/sys/kern/vfs_bio.c Wed Oct 15 19:41:51 2014 (r273147)
+++ stable/9/sys/kern/vfs_bio.c Wed Oct 15 19:46:49 2014 (r273148)
@@ -520,6 +520,10 @@ bd_speedup(void)
mtx_unlock(&bdlock);
}
+#ifndef NSWBUF_MIN
+#define NSWBUF_MIN 16
+#endif
+
#ifdef __i386__
#define TRANSIENT_DENOM 5
#else
@@ -631,11 +635,10 @@ kern_vfs_bio_buffer_alloc(caddr_t v, lon
* 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
#ifdef DIRECTIO
ffs_rawread_setup();
#endif
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