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Re: RFC: NAPI packet weighting patch

from [Rick Jones] [Permanent Link][Original]
To: netdev@xxxxxxxxxxx
Subject: Re: RFC: NAPI packet weighting patch
From: Rick Jones <rick.jones2@xxxxxx>
Date: Wed, 22 Jun 2005 13:35:46 -0700
Cc: hadi@xxxxxxxxxx, becker@xxxxxxxxx
In-reply-to: <20050622.132241.21929037.davem@davemloft.net>
References: <1119458226.6918.142.camel@localhost.localdomain> <200506221801.j5MI11xS021866@guinness.s2io.com> <20050622180654.GX14251@wotan.suse.de> <20050622.132241.21929037.davem@davemloft.net>
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Everyone seems to have this absolute fetish about batching the RX
descriptor refilling work.  It's wrong, it should be done when you
pull a receive packet off the ring, for many reasons.  Off the top of
my head:

1) Descriptors are refilled as soon as possible, decreasing
   the chance of the device hitting the end of the RX ring
   and thus unable to receive a packet.


IFF one pokes the NIC for each buffer right?

rick jones

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