Messages in this thread | | | From | David Laight <> | Subject | RE: [PATCH 05/15] RDS: increase size of hash-table to 8K | Date | Mon, 21 Sep 2015 08:31:23 +0000 |
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From: Santosh Shilimkar > Sent: 20 September 2015 00:05 > Even with per bucket locking scheme, in a massive parallel > system with active rds sockets which could be in excess of multiple > of 10K, rds_bin_lookup() workload is siginificant because of smaller > hashtable size. > > With some tests, it was found that we get modest but still nice > reduction in rds_bind_lookup with bigger bucket. > > Hashtable Baseline(1k) Delta > 2048: 8.28% -2.45% > 4096: 8.28% -4.60% > 8192: 8.28% -6.46% > 16384: 8.28% -6.75% > > Based on the data, we set 8K as the bind hash-table size.
Can't you use of on the dynamically sizing hash tables? 8k hash table entries is OTT for a lot of systems.
David
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