REPOST: Performance problems with FTP

[Kent Stewart]

On Tuesday 29 June 2004 11:02 am, Bill Moran wrote:
> I'm having some really weird problems with ftp performance on FreeBSD
> 4.10 that I just can't seem to figure out.
>
> My uplink here maxes out at about 35k/sec.  If I scp to the machine
> in question I get about 30k/sec (which is expected) but when I ftp, I
> never get anything better than 15k/sec, and occasionally as low as
> 8k/sec.
>
> Using a server colocated at another facility, I can ftp at about
> 45k/sec, and scp at about 60k/sec.
>
> Downloads are all as expected ... scp and ftp downloads seem to be in
> about the same range, and it's a number I would expect.
>
> I tried running the ftp daemon that ships with FreeBSD, as well as
> Proftpd and they both exhibit the same performance issues.
>
> Most settings on this machine are at their defaults.  I've tried
> tweaking send/recv sizes, as well as toggling delayed_ack.  None of
> these have made any difference so far.
>
> Suggestions?  Is anyone else seeing this?

I want to add that I have a machine that did that once in awhile. As 
soon as I see it, I look at my switch and the NIC has switched into 
half-duplex. An ifconfig still shows full-duplex. I would power down 
and reboot and it went away for awhile.

After having done this 3 or 4 times, I powered it down, reseated the NIC 
and it has been a little over three weeks since it flipped modes on me.

Kent

-- 
Kent Stewart
Richland, WA

http://users.owt.com/kstewart/index.html