netdev - Re: [PATCH] tcp: Fix sysctl_tcp_max_orphans when PAGE

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Date:	Thu, 26 Aug 2010 10:38:34 +1000
From:	Anton Blanchard <anton@...ba.org>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org, miltonm@....com
Subject: Re: [PATCH] tcp: Fix sysctl_tcp_max_orphans when PAGE_SIZE != 4k


Hi Dave,

> Yeah, something like the following, Anton?

Thanks! I tested on a 512GB box. One thing:

# cat /proc/sys/net/ipv4/tcp_max_syn_backlog 
128

We probably want to use max():

> -	sysctl_max_syn_backlog = min(128, cnt / 256);
> +	sysctl_max_syn_backlog = max(128, cnt / 256);

With that change:

# cat /proc/sys/net/ipv4/tcp_max_orphans 
262144
# cat /proc/sys/net/ipv4/tcp_max_tw_buckets
262144
# cat /proc/sys/net/ipv4/tcp_max_syn_backlog 
2048


Tested-by: Anton Blanchard <anton@...ba.org>

Anton
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