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Date: Tue, 13 Nov 2007 18:54:12 +0100 From: Florian Boelstler <kernel@...lstler.net> To: netdev@...r.kernel.org Cc: linux-kernel@...r.kernel.org Subject: Re: Strange delays / what usually happens every 10 min? Hi Eric, Eric Dumazet wrote: > Instead of using less RAM, you could just boot with rhash_entries=1024 > to lower the size of this table. I just tried that and it seems to reduce the scan time. This is the result for the first 40 minutes of runtime: root@...0:/# /tmp/wait.rt looping 1 milli seconds nanosleep ... 17:10:11/425384 #1 MAX 1996/83117/-268599896 us/tick/usec (at 2107848557) 17:10:11/427385 #2 MAX 2001/83327/2001 us/tick/usec (at 2107931884) 17:10:11/433534 #5 MAX 2149/89477/2150 us/tick/usec (at 2108187839) 17:27:02/5897 #505291 MAX 2512/104576/2513 us/tick/usec (at 1223589469) The first ~10ms delay usually occurred after ~15 minutes. So one could argue that the reported HIGH-value at 17:27:02 (GMT) is the first flush of IP route cache. And all later flushes weren't longer than 2,5ms. Thanks to all of you, especially Eric. Now it seems I got an instrument to lower system response time. Cheers, Florian PS: Unfortunately I had to remove some CC:-entries since the local firewall seems to not allow anything but NNTP (for gmane) and HTTP. - 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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