* On Sat, Dec 24, 2011 at 09:57:50PM +0530, Mukesh Yadav <mukesh.fkd@gmail.com> wrote:
Hi Raghavendra,
" /proc/sys/net/core/bpf_jit_**enable " is not present on machine. Seems kernel need to be configured for these. Yes, it is a fairly new option -- CONFIG_BPF_JIT=y
Btw CPU scaling issue is resolved. Packet drop was because all interrupt handling was happening on core where packets were getting drop. Tuning system for interrupt handling using smp_affinity resolved the issue. That is generally how it is done. The core which handles packets initially handles the interrupts too. Do you mean all non-network interrupts were happening on same core ? Then give irqbalance a shot.
Thanks Mukesh
On 22 December 2011 19:18, Raghavendra D Prabhu <raghu.prabhu13@gmail.com>wrote:
Hi,
Have you tried enabling -- /proc/sys/net/core/bpf_jit_**enable -- provides JIT compiled BPF on 64 bit linux.
* On Wed, Dec 21, 2011 at 12:08:04AM +0530, Mukesh Yadav < mukesh.fkd@gmail.com> wrote:
Hi Guys,
I am working on user level code which uses BPF filter. Solution has two threads and BPF filter for incoming packets to raw socket dedicated to each thread. Intent is to divide ingress traffic between two thread based on whether dest IP is even or odd.
BPF filters used are: Even IP filter :-> tcpdump -i interface 'ether dst <dest mac> && ip[19] & 0x01 = 0' Odd IP filter :-> tcpdump -i interface 'ether dst <dest mac> && ip[19] & 0x01 = 1'
There is a packet loss for odd IP thread even when CPU is available. Reason being packet drop due recv buffer full. Same amount of traffic is well handled by even IP thread(user code being same in both), scaling CPU to full 100%.
In odd IP thread, If filter is changed to "tcpdump -i interface 'ether dst <dest mac> && ip proto 17' ", all goes fine. Also CPU usage at kernel drops from 50% to 4 % for a particular amount of traffic.
Would appreciate any I/ps for reducing load at kernel for packet filtering(Odd/Even IP distribution)
Cheers Mukesh
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