From: David Miller <davem@davemloft.net>
To: dada1@cosmosbay.com
Cc: netdev@vger.kernel.org
Subject: Re: [PATCH] [NET] Size listen hash tables using backlog hint
Date: Thu, 19 Oct 2006 01:41:20 -0700 (PDT) [thread overview]
Message-ID: <20061019.014120.78710373.davem@davemloft.net> (raw)
In-Reply-To: <200610191029.00720.dada1@cosmosbay.com>
From: Eric Dumazet <dada1@cosmosbay.com>
Date: Thu, 19 Oct 2006 10:29:00 +0200
> Cons :
> TLB cost
For those hot x86 and x86_64 cpus you tend to be using, this
particular cost is relatively small. :-) It's effectively like
another memory reference in the worst case, in the best case
it's "free".
> With actual somaxconn=128 limit, my patch ends in allocating less
> ram (half of a page) than current x86_64 kernel (2 pages)
Understood. But the issue is that there are greater security
implications than before when increasing this sysctl.
To be honest, it's probably water under the bridge, because
if you can stuff up SOMAXCONN number of sockets into the
system per listening socket which is a lot more than the
hash table eats up. :-)
next prev parent reply other threads:[~2006-10-19 8:41 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-17 0:53 [PATCH] Bound TSO defer time (resend) John Heffner
2006-10-17 3:20 ` Stephen Hemminger
2006-10-17 4:18 ` John Heffner
2006-10-17 5:35 ` David Miller
2006-10-17 12:22 ` John Heffner
2006-10-19 3:39 ` David Miller
2006-10-17 12:58 ` [PATCH] [NET] Size listen hash tables using backlog hint Eric Dumazet Hi
2006-10-18 7:38 ` [PATCH] [NET] inet_peer : group together avl_left, avl_right, v4daddr to speedup lookups on some CPUS Eric Dumazet
2006-10-18 16:35 ` [PATCH] [NET] reduce per cpu ram used for loopback stats Eric Dumazet
2006-10-18 17:00 ` [PATCH, resent] " Eric Dumazet
2006-10-19 3:53 ` David Miller
2006-10-19 3:53 ` [PATCH] " David Miller
2006-10-19 3:44 ` [PATCH] [NET] inet_peer : group together avl_left, avl_right, v4daddr to speedup lookups on some CPUS David Miller
2006-10-19 10:57 ` Eric Dumazet
2006-10-19 15:45 ` [PATCH] [NET] One NET_INC_STATS() could be NET_INC_STATS_BH in tcp_v4_err() Eric Dumazet
2006-10-20 7:22 ` David Miller
2006-10-20 14:21 ` Arnaldo Carvalho de Melo
2006-10-20 7:28 ` [PATCH] [NET] inet_peer : group together avl_left, avl_right, v4daddr to speedup lookups on some CPUS David Miller
2006-10-19 3:31 ` [PATCH] [NET] Size listen hash tables using backlog hint David Miller
2006-10-19 4:54 ` Stephen Hemminger
2006-10-19 5:08 ` David Miller
2006-10-19 5:12 ` Eric Dumazet
2006-10-19 6:12 ` David Miller
2006-10-19 6:34 ` Eric Dumazet
2006-10-19 6:57 ` David Miller
2006-10-19 8:29 ` Eric Dumazet
2006-10-19 8:41 ` David Miller [this message]
2006-10-19 9:11 ` Eric Dumazet
2006-10-19 9:27 ` Eric Dumazet
2006-10-20 7:27 ` David Miller
2006-10-18 15:37 ` [PATCH] Bound TSO defer time (resend) Andi Kleen
2006-10-18 16:40 ` Stephen Hemminger
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