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
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=342400
@ -62,14 +62,14 @@ static MALLOC_DEFINE(M_MTXPOOL, "mtx_pool", "mutex pool");
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/* Pool sizes must be a power of two */
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#ifndef MTX_POOL_SLEEP_SIZE
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#define MTX_POOL_SLEEP_SIZE 128
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#define MTX_POOL_SLEEP_SIZE 1024
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#endif
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struct mtxpool_header {
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int mtxpool_size;
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int mtxpool_mask;
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int mtxpool_shift;
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int mtxpool_next;
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int mtxpool_next __aligned(CACHE_LINE_SIZE);
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};
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struct mtx_pool {
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