Ahhh, that may explain why, during FTP receive of a large file
over a 5 KB/s link with a 56 KB recv window, I get one or two
dropped packets at the same point every time, and then no
further dropped packets for the rest of the transfer.
Barney Wolff wrote:
> On Fri, Oct 17, 2003 at 08:16:32PM -040
> Andre Oppermann wrote:
> Carl Mascott wrote:
> >
> > Here's a case that your logic does not handle correctly.
> >
> > 1. Kernel default buffer size = 32 KB
> >
> > 2. Routing table buffer size = 48 KB
> >
> > 3. Application sets buffer size to 32 KB
> >
> > 4. tcp_mss() selects 48 KB buffer
Sorry, but you are mistaken, and I can e-mail you the tcpdump
output to prove it.
As I said, I'm running 4.8-R with the PR 11966 patch backed
out. With this kernel, and with any stock FreeBSD 4.6-R or
earlier, the TCP implementation _will_ shrink the receive
window after the connection is establi
On Fri, Oct 17, 2003 at 08:16:32PM -0400, Carl Mascott wrote:
>
> NOTE: AFAIK, 4.4BSD through FreeBSD 4.6-R seem to have done
> alright without the PR 11966 patch, but if someone knows
> different, please speak up.
I'm not really surprised. I would have thought that a well-behaved
sender would b
Carl Mascott wrote:
>
> Here's a case that your logic does not handle correctly.
>
> 1. Kernel default buffer size = 32 KB
>
> 2. Routing table buffer size = 48 KB
>
> 3. Application sets buffer size to 32 KB
>
> 4. tcp_mss() selects 48 KB buffer size, giving the routing
>table precedence
Here's a case that your logic does not handle correctly.
1. Kernel default buffer size = 32 KB
2. Routing table buffer size = 48 KB
3. Application sets buffer size to 32 KB
4. tcp_mss() selects 48 KB buffer size, giving the routing
table precedence over the application.
I found it necessary
Carl Mascott wrote:
I have a few TCP window size issues.
[skip]
3. RFC 793 (TCP) says that shrinking the receive window after
connection is established is "strongly discouraged". I'm
currently shrinking the receive window on my default route
(PPP link) from 32 KB to 4 KB with settings in
Andre Oppermann wrote:
>
> Carl Mascott wrote:
> >
> > Actually I have just fixed it in my copy of 4.8-R. I have a document
> > that describes the problem and my solution. I could send you that
> > and/or a set of patches. You might want to sketch out your own
> > solution before you look at mi
Carl Mascott wrote:
>
> Actually I have just fixed it in my copy of 4.8-R. I have a document
> that describes the problem and my solution. I could send you that
> and/or a set of patches. You might want to sketch out your own
> solution before you look at mine, though. Also, I'm not done
> tes
Actually I have just fixed it in my copy of 4.8-R. I have a document
that describes the problem and my solution. I could send you that
and/or a set of patches. You might want to sketch out your own
solution before you look at mine, though. Also, I'm not done
testing mine yet.
> Carl Mascott wr
Carl Mascott wrote:
>
> I have a few TCP window size issues.
>
> 1. In FreeBSD 4.8-R the kernel default recv window is 56 KB. This
>is so large that it causes dropped packets due to queue overflow
>with my V.90 link (BW 5 KB/s on compressed data).
>
> 2. The 4.4BSD TCP implementation ha
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