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Date:	Mon, 19 Nov 2007 22:43:57 -0800 (PST)
From:	David Miller <>
Subject: Re: [PATCH] IPV4 : Move ip route cache flush (secret_rebuild) from
 softirq to workqueue

From: Eric Dumazet <>
Date: Sat, 17 Nov 2007 10:41:47 +0100

> [PATCH] IPV4 : Move ip route cache flush (secret_rebuild) from softirq to workqueue
> Every 600 seconds (ip_rt_secret_interval), a softirq flush of the whole
> ip route cache is triggered. On loaded machines, this can starve softirq for
> many seconds and can eventually crash.
> This patch moves this flush to a workqueue context, using the worker we
> intoduced in commit 39c90ece7565f5c47110c2fa77409d7a9478bd5b
> (IPV4: Convert rt_check_expire() from softirq processing to workqueue.)
> Also, immediate flushes (echo 0 >/proc/sys/net/ipv4/route/flush) are using
> rt_do_flush() helper function, wich take attention to rescheduling.
> Next step will be to handle delayed flushes
> ("echo -1 >/proc/sys/net/ipv4/route/flush"  or
> "ip route flush cache")
> Signed-off-by: Eric Dumazet <>

Applied, thanks Eric.
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