On Oct 4, 2005, at 6:56 PM, Dave+Seddon wrote:
You mention your running at "near" line rate. What are you pushing
or pulling? Whats the rough spec of these machines pushing out
this much data? What setting do you have for the polling? I've
been trying to do near line rate and can't even get close with new
HP-DL380s (Single 3.4 Ghz Xeon). I think the PCI bus might be the
problem. The em Intel NICs I found to be very slow and stop after
about 3 hours. - The Intel NICs I have are dual port, although
they end up on seperate IRQs.
In one case, we had a system acting as a router. It was a Dell
PowerEdge 2650, with two dual "server" adapters. each were on
separate PCI busses. 3 were "lan" links, and one was a "wan" link.
The lan links were receiving about 300mbps each, all going out the
"wan" link at near 900mbps at peak. We were never able to get above
944mbps, but I never cared enough to figure out where the bottleneck
was there.
This was with PCI-X, and a pretty stripped config on the server side.
Nothing fancy on polling, i think we set HZ to 10000, turned on
idle_poll, and set user_frac to 10 because we had some cpu hungry
tasks that were not a high priority.
For anyone watching, the config we had there that we were successful
with was:
[EMAIL PROTECTED]:6:0: class=0x020000 card=0x10118086 chip=0x10108086
rev=0x01 hdr=0x00
vendor = 'Intel Corporation'
device = '82546EB Dual Port Gigabit Ethernet Controller (Copper)'
class = network
subclass = ethernet
[EMAIL PROTECTED]:6:1: class=0x020000 card=0x10118086 chip=0x10108086
rev=0x01 hdr=0x00
vendor = 'Intel Corporation'
device = '82546EB Dual Port Gigabit Ethernet Controller (Copper)'
class = network
subclass = ethernet
[EMAIL PROTECTED]:8:0: class=0x020000 card=0x10128086 chip=0x10128086
rev=0x01 hdr=0x00
vendor = 'Intel Corporation'
device = '82546EB Dual Port Gigabit Ethernet Controller (Fiber)'
class = network
subclass = ethernet
[EMAIL PROTECTED]:8:1: class=0x020000 card=0x10128086 chip=0x10128086
rev=0x01 hdr=0x00
vendor = 'Intel Corporation'
device = '82546EB Dual Port Gigabit Ethernet Controller (Fiber)'
class = network
subclass = ethernet
We also have some web servers that are sending 300-400mbps each at
peak using thttpd or lighttpd, with the built in Dell 2850 em parts.
They also are connected via PCI-X speed buses internally.
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