linux-kernel - Re: cups slow on linux-2.6.24

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Date:	Thu, 31 Jan 2008 19:53:57 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>
CC:	Jeff Chua <jeff.chua.linux@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Krzysztof Piotr Oledzki <ole@....pl>,
	"David S. Miller" <davem@...emloft.net>,
	cups-bugs <cups-bugs@...ysw.com>,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>
Subject: Re: cups slow on linux-2.6.24

Jozsef Kadlecsik wrote:
> Hi Jeff,
> 
> On Thu, 31 Jan 2008, Jeff Chua wrote:
> 
>> On the bad run, I got the following message ...
>>
>> boston kernel: nf_ct_tcp: invalid packed ignored IN= OUT=
>> SRC=127.0.0.1 DST=127.0.0.1 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=8162
>> DF PROTO=TCP SPT=1016 DPT=515 SEQ=3834958843 ACK=0 WINDOW=32792
>> RES=0x00 SYN URGP=0 OPT (0204400C0402080A0000CC190000000001030307)
>> UID=0 GID=65534
> 
> I can't find this packet in the last lo.bad pcap file. Could you dump the 
> bad traffic and send it together with the generated log record?
> 
> Strange, but there are a lot of incorrect checksum packets. How does it 
> come on the loopback interface?


Loopback doesn't perform full checksumming, so thats expected.
Current kernel versions can tell userspace that its only a
partial checksum, but I'm not sure whether tcpdump already
supports this.
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