Hi Oren,
do you have two threads per RSS queue (4 in total?), or one thread per
RRS queue (2 in total)?
In libpcap/PF_RING we receive packets in zero copy (see pcap-linux.c)
and this could explain the behaviour in case of 4 thread. Is this the
case perhaps?
Regards Luca
On 10/02/2013 02:32 PM, Oren Nechushtan wrote:
Hi,
We are experiencing a strange issue with PF_RING/libpcap with the
packet payload changing right under the hood within the callback,
without any apparent reason.
The flow is basically running two threads on eth2@0 and eth2@1 RSS queues
callBack()
pcap_read_packet()
pcap_read_linux()
pcap_dispatch()
..
main()
I am working on simplify and generate an example though it is not an
easy task.
# uname -a
Linux ct10k 2.6.32-220.4.2.el6.i686 #1 SMP Tue Feb 14 00:24:28 GMT
2012 i686 i686 i386 GNU/Linux
# cat /proc/net/pf_ring/7592-eth2.49*
Bound Device(s): eth2
Active: 1
Breed: Non-DNA
Sampling Rate: 1
Capture Direction: RX only
Socket Mode: RX+TX
Appl. Name: <unknown>
IP Defragment: No
BPF Filtering: Disabled
# Sw Filt. Rules: 0
# Hw Filt. Rules: 0
Poll Pkt Watermark : 1
Num Poll Calls: 0
Channel Id Mask: 0x00000001
Cluster Id: 0
Slot Version: 15 [5.6.0]
Min Num Slots: 5399
Bucket Len: 1519
Slot Len: 1552 [bucket+header]
Tot Memory: 8388608
Tot Packets: 639755
Tot Pkt Lost: 362816
Tot Insert: 276939
Tot Read: 268808
Insert Offset: 2594936
Remove Offset: 2597608
TX: Send Ok: 0
TX: Send Errors: 0
Reflect: Fwd Ok: 0
Reflect: Fwd Errors: 0
Num Free Slots: 0
Bound Device(s): eth2
Active: 1
Breed: Non-DNA
Sampling Rate: 1
Capture Direction: RX only
Socket Mode: RX+TX
Appl. Name: <unknown>
IP Defragment: No
BPF Filtering: Disabled
# Sw Filt. Rules: 0
# Hw Filt. Rules: 0
Poll Pkt Watermark : 1
Num Poll Calls: 0
Channel Id Mask: 0x00000002
Cluster Id: 0
Slot Version: 15 [5.6.0]
Min Num Slots: 5399
Bucket Len: 1519
Slot Len: 1552 [bucket+header]
Tot Memory: 8388608
Tot Packets: 619081
Tot Pkt Lost: 124764
Tot Insert: 494317
Tot Read: 481677
Insert Offset: 7515736
Remove Offset: 5550312
TX: Send Ok: 0
TX: Send Errors: 0
Reflect: Fwd Ok: 0
Reflect: Fwd Errors: 0
Num Free Slots: 0
[root@ct10k forescout]# ethtool -i eth2
driver: ixgbe
version: 3.11.33
firmware-version: 0x800000cb
bus-info: 0000:06:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
A potential hint is that the issue correlates with being at the end of
the ring, e.g.,
(gdb) p bp-handle->ring->buffer
$2 = 8386304
Any advice would be welcome,
Best,
Oren
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