On Nov 3, 2006, at 6:52 AM, Paulo Afonso Lopes wrote:
Hi, all.
I have measured a 40% to 30% decrease in CPU use (Xeon 2.4G, 512k
cache)
in IBM x335 with the mobo's Broadcom NIC (5703), at 80 MB/s (one port
only)by going to MTU 9000 instead of the std 1500 (kernel 2.4).
cool.
Some Bcom NICs do support jumbo, others (as the one in the HP DL145/
G2,
Bcom 5721) do not. I have not played with interrupt coalescing, but
it's
supposed to help a bit, too.
I did not know Bcom NICs had some offload capabilities; can you
point out
where to look (or am I missing the point and you - Rob - are not using
Bcom?)
On the G5 xserve, lspci sez:
0001:07:04.0 Ethernet controller: Broadcom Corporation NetXtreme
BCM5704 Gigabit Ethernet (rev 03)
0001:07:04.1 Ethernet controller: Broadcom Corporation NetXtreme
BCM5704 Gigabit Ethernet (rev 03)
and we have
# ethtool -k eth0
Offload parameters for eth0:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: off
--bob
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