From: cold cold <nedkonedev@gmail.com>
To: netdev@vger.kernel.org
Subject: 0% cpu usasge after fresh boot or net restart but 10% CPU if kernel flush route cache
Date: Tue, 26 Jan 2010 18:58:31 +0200 [thread overview]
Message-ID: <41ac0f9e1001260858o7d2a6a6dgb37ecfba5c325932@mail.gmail.com> (raw)
HI,
i have expiriance some CPU usage spikes up to 10% on each four cpus
after the first kernel route cache flush.
After mashine start first 20 min CPU is 0%si 300Mbits/s full duplex
and arount 100k pps forwarded traffic, without any firewall, just
plain routing.
route -n |wc -l
34
ip route show cache | wc -l
2140842
cat /proc/sys/net/ipv4/route/secret_interval
600
cat /proc/sys/net/ipv4/route/max_size
33554432
after kernel flush i got 10% on all CPUs for 5-6 mins. It's not from
rebuilding route cashe becouse after
fresh boot or network restrat there is no CPU usage until kernel flush
route cache.
I try to play with rhash_entries= 300000 to 2000000 same result.
Network Card: Ethernet controller: Intel Corporation 82576 Gigabit
Network Connection
CPU: Intel(R) Xeon(R) CPU E5420 @ 2.50GHz
RAM: 4G
Kernel: vanilla 2.6.32.4
next reply other threads:[~2010-01-26 16:58 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-26 16:58 cold cold [this message]
2010-01-27 15:26 ` 0% cpu usasge after fresh boot or net restart but 10% CPU if kernel flush route cache Eric Dumazet
2010-01-27 19:53 ` cold cold
2010-01-27 21:18 ` Eric Dumazet
2010-01-28 9:14 ` cold cold
2010-01-28 16:09 ` Eric Dumazet
2010-01-28 16:26 ` cold cold
2010-01-28 17:06 ` Eric Dumazet
2010-01-28 18:49 ` cold cold
2010-01-28 21:16 ` Eric Dumazet
2010-01-29 7:38 ` cold cold
2010-01-29 9:06 ` Eric Dumazet
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