REPOST: Performance problems with FTP
kstewart at owt.com
Tue Jun 29 14:39:31 PDT 2004
On Tuesday 29 June 2004 02:05 pm, Jorn Argelo wrote:
> Kent Stewart wrote:
> >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.
> But even if it is an 10 MBit NIC running half duplex, it should still
> be capable of handling internet traffic at normal speeds (200 - 300
> KB/s or something, depends on your line of course)
> My first insight of those problems is probably bad DNS settings. What
> about FTPing to your ip address? Is that giving you the bad speed as
That only occurs when both ifconfig and the NIC are set at half-duplex.
The system is on a local network and all systems are in the hosts
table. The network is 100Mb/s but the ftp xfer rate would drop to
8KB/s. It is my test system and the drop from 11MB/s to 8KB/s was
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