Tuning: 100mbit faster, gbit slower.
josh at tcbug.org
Mon Mar 24 15:41:06 UTC 2008
On Monday 24 March 2008 06:22:12 am Daniel Andersson wrote:
> Thanks for the reply! Maybe I should have been more clear.
> My setup looks like this:
> internet - em1(server box) em0 - windoze desktop.
> The internet(em1) 100mbit seems to do fine, even better than
> before, I get about 11mb/s with rtorrent(uploading). It's the
> internal gbit connection that's weird with ftp. It not as fast nor
> as smooth as it was before I did the "tuning". I doesn't have
> any trouble running ftping at 30mb/s after the tuning so it is
> definately capabel of delivering 100mbit?
I think we are having a terminology problem here. Are you meaning 30mb/s as
in 30 megabits per second (30% of 100TX speed) or do you mean 30 MB/s as in
30 Megabytes/sec? I think in rereading you post you are meaning Megabytes
but using the terminology for megabits.
So here's what I've done to nearly saturate gig-e. Keep in mind that I have
15k SAS drives and intel gig-e adapters that aren't sitting in 33mhz 32bit
PCI slots, single IDE/SATA drives are going to be a bottleneck as are 33mhz
32bit PCI NICs.
This is on RELENG_6_3
ifconfig em0 mtu 9014 (You'll need a switch that supports jumbo frames to do
iperf shows wire traffic around 969 mbps and FTP runs at 110 Megs/sec
scp/sftp appears to be cpu bound at 45 Megs/sec, and NFS with TCP mounts and
send/receive packets set to 16384 manages about 90 Megs/sec.
PGP: 8A48 EF36 5E9F 4EDA 5A8C 11B4 26F9 01F1 27AF AECB
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