Date: Wed, 15 Mar 2000 23:13:55 +0000 From: Ian Dowse <iedowse@maths.tcd.ie> To: Mike Smith <msmith@freebsd.org> Cc: yramin <yramin@redshift.com>, howardl@account.abs.net, freebsd-current@freebsd.org Subject: Re: Best NIC for FBSD (was: Buffer Problems and hangs in 4.0-CURRENT..) Message-ID: <200003152313.aa85970@salmon.maths.tcd.ie> In-Reply-To: Your message of "Wed, 15 Mar 2000 12:53:43 PST." <200003152053.MAA01346@mass.cdrom.com>
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In message <200003152053.MAA01346@mass.cdrom.com>, Mike Smith writes: >> fxp0: The Intel driver is by far the highest preformance model, >> beats the 3com (second best) hands down with much lower CPU >> overhead. > >Do you actually have any numbers to quantify this? There's nothing in >the driver architecture nor any of my testing that would suggest this is >actually the case at this point. The FreeBSD fxp driver does a lot to reduce the number of transmit interrupts; only 1/120 of transmitted packets result in interrupts. See the code relating to FXP_CXINT_THRESH. Assuming an even balance of transmitted and received packets, this should reduce the total number of interrupts by nearly 50%. I don't know if drivers for other cards do (or even can) use this approach. Ian To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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