linux-kernel - Re: RFC: issues concerning the next NAPI interface

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Message-ID: <000501c7e6bd$2576d260$6501a8c0@earthlink.net>
Date:	Fri, 24 Aug 2007 19:10:43 -0700
From:	"Mitchell Erblich" <erblichs@...thlink.net>
To:	"Jan-Bernd Themann" <ossthema@...ibm.com>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Re: RFC: issues concerning the next NAPI interface

Jan-Bernd Themann,

                  IMO, a box must be aware of the speed of all its
interfaces, whether the
                  interface impliments tail-drop or RED or XYZ, the latency
to access the
                  packet, etc.

                  Then when a packet arrives, a timer is started for
interrupt colelesing,
                  and to process awaiting packets, if tail-drop is
implemented, it is
                  possible to wait until a the input FIFO fills to a
specific point before
                  starting a timer.

                  This may maximize the number of packets per interupt. And
realize that
                  the worse case of a interrupt per packet is wirespeed
pings (echo
                  request/reply) of 64 bytes per packet.

                   Mitchell Erblich




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