Author: jkim
Date: Tue Oct 7 20:13:47 2014
New Revision: 272718
URL: https://svnweb.freebsd.org/changeset/base/272718
Log:
Make kern.nswbuf tunable from loader.
MFC after: 1 week
Modified:
head/sys/kern/vfs_bio.c
Modified: head/sys/kern/vfs_bio.c
==============================================================================
--- head/sys/kern/vfs_bio.c Tue Oct 7 19:08:02 2014 (r272717)
+++ head/sys/kern/vfs_bio.c Tue Oct 7 20:13:47 2014 (r272718)
@@ -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, 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
/*
* Reserve space for the buffer cache buffers
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