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Re: RFC: NAPI packet weighting patch

To: Donald Becker <becker@xxxxxxxxx>
Subject: Re: RFC: NAPI packet weighting patch
From: Andi Kleen <ak@xxxxxxx>
Date: Wed, 22 Jun 2005 00:34:36 +0200
Cc: Andi Kleen <ak@xxxxxxx>, Rick Jones <rick.jones2@xxxxxx>, netdev@xxxxxxxxxxx, davem@xxxxxxxxxx
In-reply-to: <Pine.LNX.4.44.0506211507110.21812-100000@bluewest.scyld.com>
References: <p73oe9zbcx0.fsf@verdi.suse.de> <Pine.LNX.4.44.0506211507110.21812-100000@bluewest.scyld.com>
Sender: netdev-bounce@xxxxxxxxxxx
> While much has changed since then, the same basic parameters remain
>    - cache line size

In 96 we had 32 byte cache lines. These days 64-128 are common,
with some 256 byte cache line systems around.

>    - frame header size (MAC+IP+ProtocolHeader)

In 96 people tended to not use time stamps.

>    - hot cache lines from copying or type classification

Not sure what you mean with that.

>    - cold memory lines from PCI writes

I suspect in '96 chipsets also didn't do as aggressive prefetching
as they do today.

-Andi

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