2011/12/7 likunyun <kunyu...@hotmail.com>:
>
>
>> From: je...@nicira.com
>> Date: Tue, 6 Dec 2011 09:52:46 -0800
>> Subject: Re: [ovs-discuss] discuss Digest, Vol 30, Issue 5
>> To: kunyu...@hotmail.com
>> CC: discuss@openvswitch.org
>
>>
>> 2011/12/6 likunyun <kunyu...@hotmail.com>:
>> >> 1. Some questions about checksum in OVS (likunyun)
>> >>
>> >>
>> >> ----------------------------------------------------------------------
>> >>
>> >> Message: 1
>> >> Date: Sat, 3 Dec 2011 12:28:32 +0000
>> >> From: likunyun <kunyu...@hotmail.com>
>> >> Subject: [ovs-discuss] Some questions about checksum in OVS
>> >> To: <discuss@openvswitch.org>
>> >> Message-ID: <blu154-w64aaecd4ab3dc5f2318a00d8...@phx.gbl>
>> >> Content-Type: text/plain; charset="gb2312"
>> >>
>> >>
>> >> Hello,
>> >>
>> >> Recently I did the rate test about open vswitch based on xen. When I
>> >> did
>> >> the test about VM-to-Native,there are some problem.
>> >> VM could ping the Native.
>> >> When VM sends UDP packet to Native(A computer without virtualization),
>> >> VM
>> >> sends millions packet but Native only get 200 packets.
>> >> When VM sends TCP packet to Native, netperf can't establish the
>> >> connection
>> >> .
>> >>
>> >> I enabled netdevice's tx csu m in VM, and also enabled the physical
>> >> netdevice's tx csum in dom0.
>> >> When I disable the netdevice's tx csum in VM. It works,Native can get
>> >> packets normally.
>> >>
>> >> When VM sends UDP packets(64byte), I fetched the skb before it was been
>> >> sent into net device driver.
>> >> I found :
>> >> skb->ip_summed =3
>> >> skb->csum_offset = 0
>> >> skb->csum_start = 6
>> >> Normally skb->csum_start should be 0x34 and skb->csum_offset shou be
>> >> 0x6
>> >>
>> >> I found the fuction set_skb_csum_pointers() in datapath/checksum.c line
>> >> 253:
>> >> void set_skb_csum_pointers(struct sk_buff *skb, u16 csum_start, u16
>> >> csum_offset)
>> >> {
>> >> OVS_CB(skb)->csum_start = csum_start;
>> >> skb->csum = csum_offset;
>> >> }
>> >> When I changed the function like below, It works,Native can get packets
>> >> normally.:
>> >> void set_skb_csum_pointers(struct sk_buff *skb, u16 csum_start, u16
>> >> csum_offset)
>> >> {
>> >> OVS_CB(skb)->csum _start = csum_start;
>> >> skb->csum_start = csum_start;
>> >> skb->csum_offset = csum_offset;
>> >> }
>> >>
>> >> Are there somebody meet this problem? Is the change reasonable?
>> >> And I am newly about ovs, How does OVS_CB(skb)->csum_start workes in
>> >> OVS ?
>> >>
>> >> Test Information:
>> >> openvswitch: 1.2.2
>> >> VM:suse11-64
>> >> tool: netperf 2.4.5
>> >> Dom0 Kernel: linux-2.6.36
>> >> net device: intel 82599
>> >> net device driver: ixgbe-3.3.8
>> >>
>> >> Thanks.
>> >
>> > I confirmed the condition ,I am so sorry that I had made a mistake.
>> > Dom0 kernel's version is 2.6.32.36 ,not 2.6.36.
>> > proto_data_valid is been defined in struct sk_buff in kernel 2.6.32.36.
>>
>> Is this a distribution kernel or is there some place where I can find
>> the kernel source for it?
> Kernel is got from SLES 11-SP1.
> address:
> https://nu.novell.com/repo/$RCE/SLES11-SP1-Update/sle-11-x86_64/rpm/src
> source file : kernel-source-2.6.32.36-0.5.2.src.rpm
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