Date: Thu, 16 Mar 1995 12:10:51 -0800 From: David Greenman <davidg@Root.COM> To: Chitra Venkatramani <chitra@cs.sunysb.edu> Cc: hackers@FreeBSD.org Subject: Re: net question Message-ID: <199503162010.MAA00215@corbin.Root.COM> In-Reply-To: Your message of "Thu, 16 Mar 95 10:23:03 EST." <199503161523.KAA21273@cs.sunysb.edu>
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> In if_ed.c, the ethernet driver, the sizes of the transmit and >receive buffers are set. For 16bit cards, the transmit buffer size >is set to 2 buffers, each 6 pages, each page being 256 bytes. >And the remaining memory is set aside for the receiver ring buffer. > >I would like to know if it is possible to set the transmit buffer >size to be larger, say 6 buffers and leave the rest for the receiver, >in software ? That is, is this parameter software configurable ? It is possible, and would require a one line patch to the driver code. It was written to support an arbitrary number of transmit buffers. I did quite a bit of testing after writing the code to determine if there was any performance difference between 2 transmit buffers and 3, 4, 5, etc. In all of my tests, the performance came out the same. I can contrive some cases where more buffers might help...but the improvement would likely be very marginal. -DG
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