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Re: TX performance of Intel 82546

To: P@xxxxxxxxxxxxxx
Subject: Re: TX performance of Intel 82546
From: Robert Olsson <Robert.Olsson@xxxxxxxxxxx>
Date: Wed, 15 Sep 2004 17:41:42 +0200
Cc: Robert Olsson <Robert.Olsson@xxxxxxxxxxx>, Harald Welte <laforge@xxxxxxxxxxxxx>, netdev@xxxxxxxxxxx
In-reply-to: <41484AC2.8090408@xxxxxxxxxxxxxx>
References: <20040915081439.GA27038@xxxxxxxxxxxxxxxxxxxxxxx> <414808F3.70104@xxxxxxxxxxxxxx> <16712.14153.683690.710955@xxxxxxxxxxxx> <41484AC2.8090408@xxxxxxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
P@xxxxxxxxxxxxxx writes:

 > So I'm guessing that increasing the PCI-X burst size setting
 > (MMRBC) will automatically get more packets sent per transfer?
 > I said previously in this thread to google for setpci and MMRBC,
 > but what I know about it is...
 > 
 > To return the current setting(s):
 > 
 > setpci -d 8086:1010 e6.b
 > 
 > The MMRBC is the upper two bits of the lower nibble, where:
 > 
 > 0 = 512 byte bursts
 > 1 = 1024 byte bursts
 > 2 = 2048 byte bursts
 > 3 = 4096 byte bursts
 > 
 > For me to set 4KiB bursts I do:
 > 
 > setpci -d 8086:1010 e6.b=0e

 Thanks!
 That should definitely be tested. Four runs w. pktgen should be enough.

                                                --ro


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