Re: cups slow on linux-2.6.24

Patrick McHardy
2008-01-31T18:54:24Z

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.