From: Alexey Vlasov <renton@renton.name>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
netdev <netdev@vger.kernel.org>
Subject: Re: Packet time delays on multi-core systems
Date: Thu, 30 Sep 2010 16:30:48 +0400 [thread overview]
Message-ID: <20100930123048.GA4094@beaver.vrungel.ru> (raw)
In-Reply-To: <1285796721.5211.156.camel@edumazet-laptop>
On Wed, Sep 29, 2010 at 11:45:21PM +0200, Eric Dumazet wrote:
> But if you send SYN packets in the same time, (logged), this might
> slow
> down the reception (and answers) of ICMP frames. LOG target can be
> quite
> expensive...
Yes, it's clear that some slow down can appear, but 100 ms is too much,
and this happens at 200 SYN packets in 2 minutes just as in my example.
On old servers where some tx/rx are missing in NIC card I don't see
such a situation even at more then 1000 SYN-packets per sec.
> Is using other rules gives same problem ?
>
> iptables -A OUTPUT -p tcp -m tcp --dport 80 --tcp-flags
No, only LOG gives such a scheme.
--
BRGDS. Alexey Vlasov.
next prev parent reply other threads:[~2010-09-30 12:32 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20100929191851.GC86786@beaver.vrungel.ru>
2010-09-29 21:45 ` Packet time delays on multi-core systems Eric Dumazet
2010-09-30 6:24 ` Alexey Vlasov
2010-09-30 6:33 ` Eric Dumazet
2010-09-30 12:23 ` Alexey Vlasov
2010-09-30 12:44 ` Eric Dumazet
2010-09-30 17:37 ` Alexey Vlasov
2010-09-30 18:03 ` Eric Dumazet
2010-09-30 18:15 ` Alexey Vlasov
2010-09-30 18:52 ` Eric Dumazet
2010-10-01 10:16 ` Alexey Vlasov
2010-10-01 12:59 ` Eric Dumazet
2010-10-01 14:18 ` Alexey Vlasov
2010-10-01 15:27 ` Eric Dumazet
2010-10-01 18:54 ` Jeff Kirsher
2010-09-30 12:30 ` Alexey Vlasov [this message]
2010-09-30 12:46 ` Eric Dumazet
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