linux (2.4.17) ethernet bridge latency

Hello.

I'm trying to optimize embedded MIPS board for network latency.
After doing some tracing I discovered that ethernet bridge
latency is quite high. I'm not posting here the numbers because
they are only meaningful for my CPU, but just for comparison
bridge processing takes 20% to 50% more time then ethernet driver
processing, which seems too high for me. After all, all it's
supposed to do is just forward the packet.

Any ideas on things to check ?
I've noticed that there are some differences in bridge code
between 2.4.17 and 2.4.22 - since upgrade is not an option,
maybe someone can knows what optimizations (if any) where done
to the bridge.

Do you patch your kernel to support bridge firewall?

pojen

"Alexander Sirotkin" <(E-Mail Removed)> wrote in message
news:bpi6q9$s3i$(E-Mail Removed)...
> Hello.
>
> I'm trying to optimize embedded MIPS board for network latency.
> After doing some tracing I discovered that ethernet bridge
> latency is quite high. I'm not posting here the numbers because
> they are only meaningful for my CPU, but just for comparison
> bridge processing takes 20% to 50% more time then ethernet driver
> processing, which seems too high for me. After all, all it's
> supposed to do is just forward the packet.
>
> Any ideas on things to check ?
> I've noticed that there are some differences in bridge code
> between 2.4.17 and 2.4.22 - since upgrade is not an option,
> maybe someone can knows what optimizations (if any) where done
> to the bridge.
>

pojen wrote:
> Do you patch your kernel to support bridge firewall?

Should I ?

>
> pojen
>
> "Alexander Sirotkin" <(E-Mail Removed)> wrote in message
> news:bpi6q9$s3i$(E-Mail Removed)...
>
>>Hello.
>>
>>I'm trying to optimize embedded MIPS board for network latency.
>>After doing some tracing I discovered that ethernet bridge
>>latency is quite high. I'm not posting here the numbers because
>>they are only meaningful for my CPU, but just for comparison
>>bridge processing takes 20% to 50% more time then ethernet driver
>>processing, which seems too high for me. After all, all it's
>>supposed to do is just forward the packet.
>>
>>Any ideas on things to check ?
>>I've noticed that there are some differences in bridge code
>>between 2.4.17 and 2.4.22 - since upgrade is not an option,
>>maybe someone can knows what optimizations (if any) where done
>>to the bridge.
>>
>
>
>