Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
> Hm, how fast is
> % dd if=/dev/zero of=/dev/null bs=1M count=100
[root at ha03 download]# dd if=/dev/zero of=/dev/null bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.00234371 seconds, 44.7 GB/s
That looks pretty dang fast to me.
However, I can eliminate the network link by piping it to nc running on
the same host, and guess what? Now it's slow again...
[root at ha03 download]# ifconfig eth3
eth3 Link encap:Ethernet HWaddr 00:15:17:5C:1B:1B
inet addr:2.1.1.1 Bcast:2.1.1.255 Mask:255.255.255.0
inet6 addr: fe80::215:17ff:fe5c:1b1b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:53291576 errors:0 dropped:0 overruns:0 frame:0
TX packets:94847554 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3761343430 (3.5 GiB) TX bytes:4219210262 (3.9 GiB)
Memory:fc6a0000-fc6c0000
[root at ha03 download]#
[root at ha03 download]# nc -l 10000 &
[1] 19909
[root at ha03 download]# dd if=/dev/zero bs=1M count=100 | nc 2.1.1.1 10000
7+0 records in
6+0 records out
6291456 bytes (6.3 MB) copied, 19.1196 seconds, 329 kB/s
[root at ha03 download]#
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