em bad performance

[Gleb Smirnoff]

On Thu, Dec 22, 2005 at 12:24:42PM +0200, Danny Braniss wrote:
D> ------------------------------------------------------------
D> Server listening on TCP port 5001
D> TCP window size: 64.0 KByte (default)
D> ------------------------------------------------------------
D> [  4] local 132.65.16.100 port 5001 connected with [6.0/SE7501WV2] port 58122 
D> (intel westvill)
D> [ ID] Interval       Transfer     Bandwidth
D> [  4]  0.0-10.0 sec  1.01 GBytes   867 Mbits/sec
D> [  4] local 132.65.16.100 port 5001 connected with [5.4/SE7501WV2] port 55269 
D> (intel westvill)
D> [ ID] Interval       Transfer     Bandwidth
D> [  4]  0.0-10.0 sec   967 MBytes   811 Mbits/sec
D> [  5] local 132.65.16.100 port 5001 connected with [6.0/SR1435VP2 port 58363  
D> (intel dual xeon/emt64)
D> [ ID] Interval       Transfer     Bandwidth
D> [  5]  0.0-10.0 sec   578 MBytes   485 Mbits/sec
D> 
D> i've run this several times, and the results are very similar.
D> i also tried i386, and the same bad results.
D> all hosts are connected at 1gb to the same switch.

So we see a strong drawback between SE7501WV2 and SR1435VP2. Let's compare the NIC
hardware. Can you plese show pciconf -lv | grep -A3 ^em on both motherboards?

-- 
Totus tuus, Glebius.
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