> ok i'll bite.
>
> i think that this might drive up TLB activity when you operate at scale
> (1000s of tcp sessions), to the point that you don't get a win from the
> technique.
The TLB activity is clean, the card should be DMAing into the ring buffer
so we dont actually reference it from the CPU. In fact you could do
disk->network and the reverse without the data touching CPU cache
> i've been playing with a ring buffer technique for userland buffering in
> which i share the buffer amongst all the sockets. it's actually the first
> real use of readv() i've seen.
>
> it's pretty nice -- requires very little memory per-session, great for
> handling idle sessions and such... unlike the usual userland buffering
> technique which is to allocate a 4k buffer per session and chew ram and
> TLB entries.
>
> i will send you a reference to the code when i release it.
That sounds like the V7 Unix tty layer. It really does.
Alan
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