e1000 performance

From: J.A. Magallon (jamagallon@able.es)
Date: Mon Jul 28 2003 - 17:28:53 EST

Hi.

I think I am getting weird performace with e1000 in 2.4.22-pre.
NetPipe gives this numbers for e1000:

Node receiver...
Master transmitter...
Latency: 0.000040
Now starting main loop
  0: 4096 bytes 7 times --> 264.18 Mbps in 0.000118 sec
  1: 8192 bytes 7 times --> 397.55 Mbps in 0.000157 sec
  2: 12288 bytes 795 times --> 475.30 Mbps in 0.000197 sec
  3: 16384 bytes 845 times --> 524.12 Mbps in 0.000238 sec
  4: 20480 bytes 786 times --> 566.84 Mbps in 0.000276 sec
  5: 24576 bytes 725 times --> 586.49 Mbps in 0.000320 sec
  6: 28672 bytes 651 times --> 605.81 Mbps in 0.000361 sec
  7: 32768 bytes 593 times --> 618.25 Mbps in 0.000404 sec
  8: 36864 bytes 540 times --> 579.82 Mbps in 0.000485 sec
  9: 40960 bytes 458 times --> 579.72 Mbps in 0.000539 sec
 10: 45056 bytes 417 times --> 565.82 Mbps in 0.000608 sec
 11: 49152 bytes 374 times --> 569.07 Mbps in 0.000659 sec
 12: 53248 bytes 347 times --> 576.62 Mbps in 0.000705 sec
 13: 57344 bytes 327 times --> 584.06 Mbps in 0.000749 sec
 14: 61440 bytes 309 times --> 587.31 Mbps in 0.000798 sec
 15: 65536 bytes 292 times --> 592.25 Mbps in 0.000844 sec
 16: 69632 bytes 277 times --> 577.42 Mbps in 0.000920 sec
 17: 73728 bytes 255 times --> 566.39 Mbps in 0.000993 sec
 18: 77824 bytes 237 times -->

Hardware:
03:01.0 Ethernet controller: Intel Corp. 82543GC Gigabit Ethernet Controller (Copper) (rev 02)

Kernel is 2.4.22-pre8, patch for MMX/SSE checksums applied:
Measuring network checksumming speed
   basic : 768.000 MB/sec
   simple : 665.600 MB/sec
func 3Dnow! skipped: not supported by CPU
func AMD-MMX skipped: not supported by CPU
   SSE1+ : 819.200 MB/sec
csum: using csum function: SSE1+
   basic : 537.600 MB/sec
   simple : 537.600 MB/sec
func AMD-MMX skipped: not supported by CPU
   SSE1+ : 588.800 MB/sec
   SSE1 : 691.200 MB/sec
csum: using csum_copy function: SSE1

No modules parameters for e1000 (default behaviour), no mtu changes, nothing.

Any ideas to up performance ?

TIA 

-- 
J.A. Magallon <jamagallon@able.es>      \                 Software is like sex:
werewolf.able.es                         \           It's better when it's free
Mandrake Linux release 9.2 (Cooker) for i586
Linux 2.4.22-pre8-jam1m (gcc 3.3.1 (Mandrake Linux 9.2 3.3.1-0.6mdk))
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This archive was generated by hypermail 2b29 : Thu Jul 31 2003 - 22:00:38 EST