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Date: Tue, 27 Oct 2009 18:01:04 -0700 (PDT) From: David Miller <davem@...emloft.net> To: bcrl@...et.ca Cc: netdev@...r.kernel.org Subject: Re: [RFC PATCH] fib_hash: improve route deletion scaling on interface drop with lots of interfaces From: Benjamin LaHaise <bcrl@...et.ca> Date: Tue, 27 Oct 2009 10:24:26 -0400 > On Mon, Oct 26, 2009 at 05:17:49PM -0700, David Miller wrote: >> > bottleneck. Next up in the network code is rt_cache_flush(). Comments? >> >> On a real router adding and removing routes is happening a lot >> whereas interface changes are rare. You're making a more common >> operation more expensive for the sake of a less common one. > > It's not a question of more common vs less common, but if the system can > recover from an adverse event within a reasonable amount of time. Tunnel > flaps occur in the real world, and this results in the change of state of > a large number of interfaces at the same time. Would it be okay if this > is wrapped in a config option? I agree that the extra overhead is not > for everyone. Having it in a config option is worse, distributions are going to turn it on so it would be protecting nothing for %99.999 of folks out there. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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