diff options
| -rw-r--r-- | sys/kern/vfs_bio.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c index 30f935c..7b1aa8e 100644 --- a/sys/kern/vfs_bio.c +++ b/sys/kern/vfs_bio.c @@ -520,6 +520,12 @@ bd_speedup(void) mtx_unlock(&bdlock); } +#ifdef __i386__ +#define TRANSIENT_DENOM 5 +#else +#define TRANSIENT_DENOM 10 +#endif + /* * Calculating buffer cache scaling values and reserve space for buffer * headers. This is called during low level kernel initialization and @@ -579,8 +585,8 @@ kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est) * to the amount of the buffer mapped for typical UFS load. * * Clip the buffer map to reserve space for the transient - * BIOs, if its extent is bigger than 90% of the maximum - * buffer map extent on the platform. + * BIOs, if its extent is bigger than 90% (80% on i386) of the + * maximum buffer map extent on the platform. * * The fall-back to the maxbuf in case of maxbcache unset, * allows to not trim the buffer KVA for the architectures @@ -589,7 +595,8 @@ kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est) if (bio_transient_maxcnt == 0 && unmapped_buf_allowed) { maxbuf_sz = maxbcache != 0 ? maxbcache : maxbuf * BKVASIZE; buf_sz = (long)nbuf * BKVASIZE; - if (buf_sz < maxbuf_sz / 10 * 9) { + if (buf_sz < maxbuf_sz / TRANSIENT_DENOM * + (TRANSIENT_DENOM - 1)) { /* * There is more KVA than memory. Do not * adjust buffer map size, and assign the rest @@ -599,10 +606,10 @@ kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est) } else { /* * Buffer map spans all KVA we could afford on - * this platform. Give 10% of the buffer map - * to the transient bio map. + * this platform. Give 10% (20% on i386) of + * the buffer map to the transient bio map. */ - biotmap_sz = buf_sz / 10; + biotmap_sz = buf_sz / TRANSIENT_DENOM; buf_sz -= biotmap_sz; } if (biotmap_sz / INT_MAX > MAXPHYS) |
