Re: Ethernet bridge performance

[Felix Radensky <felix@allot.com>]

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Hi, Jamal

I guess you were not reading my first posting
very carefully :)

2.4.22 has NAPI capable e1000 driver and I've
compiled the driver with NAPI support.

So running non-NAPI driver is not my problem.

Felix.

jamal wrote:

>Actually seems his biggest problem is he is not running
>the NAPI driver
>
>cheers,
>jamal
>
>On Thu, 2003-08-07 at 15:09, Robert Olsson wrote:
>  
>
>>Felix Radensky writes:
>> > Thanks for your help, Ben. What is skb-recycle patch
>> > and where can I find it ?
>> 
>> It's experimental and not updated for almost a year and current 
>> implementation does not add anything to SMP. Got some idea how
>> to improve this... but try to keep to slab as long as possible 
>> it has been improved.
>>
>> Routing/bridging on SMP has affinty problem. If you are passing
>> skb's say from eth0 to eth1 and they are bound on different CPU's
>> you get cache boucing since the TX-interrupts come on another CPU.
>>
>> In a recent test with pktgen:
>> 300 kpps with TX interrupts on same CPU as sender.
>> 198 kpps with TX intr on different CPU as sender.
>>
>> Recycling tries to address this but current implementation fails
>> as said.
>>
>> But you are probably hit by something else... Check were the drops 
>> happens qdisc?. NIC ring RX/TX size, Number of interrupts. ksoftird 
>> priority, link HW_FLOW control, checksumming, affinity etc. 
>>
>> 
>> Cheers.
>>						--ro
>>
>>
>>    
>>
>
>  
>


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