Date: Mon, 13 Oct 1997 00:38:52 +0100 From: Brian Somers <brian@awfulhak.org> To: dg@root.com Cc: John Dowdal <jdowdal@destiny.erols.com>, Jerry Hicks <wghhicks@ix.netcom.com>, stable@FreeBSD.ORG Subject: Re: ftp transfers crawling... Message-ID: <199710122338.AAA10331@awfulhak.demon.co.uk> In-Reply-To: Your message of "Sun, 12 Oct 1997 09:47:36 PDT." <199710121647.JAA03859@implode.root.com>
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> >> Since about Wednesday's make world of 2.2-STABLE, I can't make *any* ftp
> >> download do better that 1K on my 28.8k modem . That's trying a lot of
> >> different sites. I'm using IJPPP. All was well before, no config
> >> changes have been made.
> >>
> >> Maybe Netcom... Anybody else notice anything?
> >
> >I am having similar problems. Few reproducable ones:
This has prompted me to do some speed testing.... the results look
good - probably because I'm comparing against a rather outdated
pppd-2.2.0 (from FreeBSD 2.2.2). All tests are transfering a 1Mb
file that's all zeros accross a null-modem ppp link:
3.0 current rel 2.2.2 PRED1 VJ Time
Oct 12 ppp ppp N Y 1:33
ppp ppp N N 1:35
ppp ppp Y Y 0:12
ppp pppd-2.2.0 N Y 3:17
pppd-2.3.1 pppd-2.2.0 N N 3:17
pppd-2.3.1 ppp N Y 1:33
Of course the PRED1 case is useless given the file contents (but it's
nice to see that it does something). The VJ results are disappointing,
although given that I have a transmission unit of 1500 and the slot
id isn't compressed talking ppp<->ppp (I'll enable this in -current
soon, but it's too dangerous for 2.2.2 at this point), VJ is reducing
40+1460 bytes down to about 4+1460 - a 2.5% gain is close to the
above (actual) 2.1% gain. Pppd-2.2.0 just doesn't seem to compare with
anything.
The second line is the most interesting (comparing rather exactly to
the last line). Serial line throughput (excluding all the ACK and
setup crud) is 88301 bps. With all the crud, this 1Mb turns into
1092851 bytes sent and 29000 bytes received. 1092851 bytes over 95
seconds = 92030 bps (assuming the UART *is* actually syncronous).
I may try to make these tests a bit more informing - I need a test
bed (read: set of sanity checks) so that I don't screw things up
again like I just did.
--
Brian <brian@Awfulhak.org>, <brian@FreeBSD.org>, <bri@OpenBSD.org>
<http://www.Awfulhak.org>;
Don't _EVER_ lose your sense of humour....
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