> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Jes Sorensen
...
>
> Ingo> yep, also with jumbo frames (mtu 9000) there is no problem at
> Ingo> all. Eg. the SysKonnect cards i use do just over 20k IRQs/sec
> Ingo> when i'm saturating 107MB/sec TCP bandwith - this IRQ load is
> Ingo> simply not a problem at all for an APIC controller. I've seen
> Ingo> IRQ rates of 80k/sec as well.
>
> Sorry but thats *BAD* performance by the SK card. I do around 2.5K
> ints/sec with the Alteon when doing 65MB/sec traffic in one direction
> with regular sized frames. The load is maybe not a problem for the
> APIC, but 80k/sec truly sucks for the CPUs considering the number of
> context saves/restores they have to do.
not necessarily bad perf by the card, but 1) the driver needs to ideally
dynamically determine the optimum # of packets/interrupt it can send
(coalesce) and 2) the pci hardware on the card needs to be able to burst
sizes which may exceed multiple frames, if the host pci mb can handle
it...and the driver must exploit this if the above hw conditions can be
met...
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