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SubjectRe: [PATCH] e1000 rx buffer allocation
On Friday 27 August 2004 12:36 pm, Chris Leech wrote:
> As for moving the allocations out of the hard interrupt context, e1000
> was one of several drivers that tried that a few years back by using
> tasklets. What I found is that if you split the allocation from the
> receive processing, it's far to easy to generate an interrupt load
> which starves the skb allocations. The result is that you
> continuously use all of the buffers then stall while they all get
> replaced, and performance is horrible. But if the patch works for
> your network load ...

We're getting 6000 interrupts per second, but the box handles it with ease.
We're getting zero loss now, but I guess with slower hardware or fewer
buffers, scheduling would be a problem.

> A better approach for improving jumbo frame allocations might be to
> use multiple smaller buffers for each receive, something the PRO/1000
> hardware can do but the e1000 driver has never taken advantage of.

Yes, that would be a far better solution. I had no idea the card could do
that. Are there specs on this hardware somewhere? Although my patch works,
I don't want to stick with a temporary solution.

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