netdev - Re: tcp bw in 2.6

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Date:	Wed, 3 Oct 2007 14:23:58 -0700
From:	lm@...mover.com (Larry McVoy)
To:	Pekka Pietikainen <pp@...oulu.fi>
Cc:	lm@...mover.com, David Miller <davem@...emloft.net>,
	torvalds@...ux-foundation.org, herbert@...dor.apana.org.au,
	wscott@...mover.com, netdev@...r.kernel.org
Subject: Re: tcp bw in 2.6

> A few notes to the discussion. I've seen one e1000 "bug" that ended up being
> a crappy AMD pre-opteron SMP chipset with a totally useless PCI bus
> implementation, which limited performance quite a bit-totally depending on
> what you plugged in and in which slot. 10e milk-and-bread-store 
> 32/33 gige nics actually were better than server-class e1000's 
> in those, but weren't that great either.

That could well be my problem, this is a dual processor (not core) athlon
(not opteron) tyan motherboard if I recall correctly.

> Check your interrupt rates for the interface. You shouldn't be getting
> anywhere near 1 interrupt/packet. If you are, something is badly wrong :).

The acks (because I'm sending) are about 1.5 packets/interrupt.
When this box is receiving it's moving about 3x ass much data
and has a _lower_ (absolute, not per packet) interrupt load.
-- 
---
Larry McVoy                lm at bitmover.com           http://www.bitkeeper.com
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