Cap on network speed in CURRENT?
brooks at one-eyed-alien.net
Tue Jun 1 17:03:06 PDT 2004
On Tue, Jun 01, 2004 at 03:38:18PM -0700, Luke wrote:
> I've got a 100Mbps LAN with ethernet cards that should be capable of using
> it, yet the highest transfer rates I seem to be able to get out of my
> FreeBSD box are 260KB/s receiving and 341KB/s sending with around 200KB/s
> being more normal.
> I realize that there are hundreds of factors that could be influencing
> this, but I came across this recent article that made me wonder if this is
> some kind of hardcoded limit:
> Is this article saying that my network speed is limited by a small
> static TCP buffer size? If so, is there some way that I can increase that
> buffer size to improve performance? The primary function of this machine
> is to move large amounts of data across my network, so I'm willing to
> experiment with increasing the buffer size if it's not too difficult.
On a LAN, buffer size has minimal effect except at very high speeds.
Without tuning, two 5.x boxes with gigabit interfaces connected to a
Cisco 6513 switch (one 5/10/04 and one 2/20/04) reached 187Mbps in
iperf. You're problems symptoms sound like duplex mismatch or bad
hardware to me.
Any statement of the form "X is the one, true Y" is FALSE.
PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4
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