Date: Sun, 29 Feb 2004 00:08:16 -0500 From: Don Bowman <don@sandvine.com> To: 'Deepak Jain' <deepak@ai.net> Cc: freebsd-hackers@freebsd.org Subject: RE: em0, polling performance, P4 2.8ghz FSB 800mhz Message-ID: <FE045D4D9F7AED4CBFF1B3B813C85337045D830C@mail.sandvine.com>
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... > > > > > > You may need to increase the MAX_RXD inside your em driver > to e.g. 512. > > I didn't know if my card had a buffer bigger than the default > 256. I can > increase it, but I didn't know how to determine how big a MAX_RXD my > card would support. When the system was under load, it was generating > 2xHZ clock ticks (2000 when HZ was 1000) is that normal? max_rxd is not a function of the card. its the system ram you devote to dma buffers. Too big will cause problems since it will flush through the cache etc. you should get (vmstat -i) a clk rate that exactly matches hz.
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