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| author | Alexander Motin <mav@FreeBSD.org> | 2018-12-24 23:52:35 +0000 |
|---|---|---|
| committer | Alexander Motin <mav@FreeBSD.org> | 2018-12-24 23:52:35 +0000 |
| commit | abeb9f61f997ba6b1015ce6346109e606944a214 (patch) | |
| tree | cec66c2646c60e4bce4c0fe79bf1eb30a852f1db /sys/kern/kern_mtxpool.c | |
| parent | 511662d083ea24a689361e8338cb28e9d09b97f6 (diff) | |
| download | src-abeb9f61f997ba6b1015ce6346109e606944a214.tar.gz src-abeb9f61f997ba6b1015ce6346109e606944a214.zip | |
Increase MTX_POOL_SLEEP_SIZE from 128 to 1024.
This value remained unchanged for 15 years, and now this bump reduces
lock spinning in GEOM and BIO layers while doing ~1.6M IOPS to 4 NVMe
on 72-core system from ~25% to ~5% by the cost of additional 28KB RAM.
While there, align struct mtx_pool fields to cache lines.
MFC after: 1 month
Notes
Notes:
svn path=/head/; revision=342400
Diffstat (limited to 'sys/kern/kern_mtxpool.c')
| -rw-r--r-- | sys/kern/kern_mtxpool.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/kern/kern_mtxpool.c b/sys/kern/kern_mtxpool.c index c220f3ef4cda..72bf0f92ed80 100644 --- a/sys/kern/kern_mtxpool.c +++ b/sys/kern/kern_mtxpool.c @@ -62,14 +62,14 @@ static MALLOC_DEFINE(M_MTXPOOL, "mtx_pool", "mutex pool"); /* Pool sizes must be a power of two */ #ifndef MTX_POOL_SLEEP_SIZE -#define MTX_POOL_SLEEP_SIZE 128 +#define MTX_POOL_SLEEP_SIZE 1024 #endif struct mtxpool_header { int mtxpool_size; int mtxpool_mask; int mtxpool_shift; - int mtxpool_next; + int mtxpool_next __aligned(CACHE_LINE_SIZE); }; struct mtx_pool { |