From: Eric Dumazet Date: Fri, 30 Nov 2012 10:08:52 +0000 (+0000) Subject: tcp: change default tcp hash size X-Git-Tag: Ubuntu-5.4-5.4.0-11.14~17633^2~142 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=fd90b29d757827ab12d6669292612308ec249532;p=mirror_ubuntu-focal-kernel.git tcp: change default tcp hash size As time passed, available memory increased faster than number of concurrent tcp sockets. As a result, a machine with 4GB of ram gets a hash table with 524288 slots, using 8388608 bytes of memory. Lets change that by a 16x factor (one slot for 128 KB of ram) Even if a small machine needs a _lot_ of sockets, tcp lookups are now very efficient, using one cache line per socket. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index e6eace1c2bdb..1aca02c9911e 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3590,8 +3590,7 @@ void __init tcp_init(void) alloc_large_system_hash("TCP established", sizeof(struct inet_ehash_bucket), thash_entries, - (totalram_pages >= 128 * 1024) ? - 13 : 15, + 17, /* one slot per 128 KB of memory */ 0, NULL, &tcp_hashinfo.ehash_mask, @@ -3607,8 +3606,7 @@ void __init tcp_init(void) alloc_large_system_hash("TCP bind", sizeof(struct inet_bind_hashbucket), tcp_hashinfo.ehash_mask + 1, - (totalram_pages >= 128 * 1024) ? - 13 : 15, + 17, /* one slot per 128 KB of memory */ 0, &tcp_hashinfo.bhash_size, NULL,