netdev - Re: [PATCH] ipv4: Remove unnecessary code from rt_check

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Date:	Tue, 26 Jun 2012 09:39:58 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ipv4: Remove unnecessary code from rt_check_expire().

On Tue, 2012-06-26 at 00:21 -0700, David Miller wrote:
> IPv4 routing cache entries no longer use dst->expires, because the
> metrics, PMTU, and redirect information are stored in the inetpeer
> cache.
> 
> Signed-off-by: David S. Miller <davem@...emloft.net>
> ---
> 
> Eric, when you did commit 9f28a2fc0bd77511f649c0a788c7bf9a5fd04edb
> (ipv4: reintroduce route cache garbage collector) do you remember
> if the thing we needed was the real expiry or both the
> rt_is_expired() and the rt_may_expire() cases?
> 
> I really want to remove rt_may_expire() from this conditional because
> it results in absolutely stupid behavior.  If your system is idle
> for 5 minutes, all of your input routing cache entries are purged.

Hmm, after a DDOS, purging all those routing cache entries in 5 minutes
is good to recover some Mbytes of kernel memory.



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