rwatson at FreeBSD.org
Thu Apr 19 10:03:37 UTC 2007
On Thu, 19 Apr 2007, Krassimir Slavchev wrote:
> The problem is when I try to access ftp servers, the connection stalls
> randomly. Also I can't do cvsup and fetch. This happens only with machines
> running -current and when the traffic is passed through router based on
> FreeBSD 4.4. One of the test machines is my notebook which have installed
> 7.0-CURRENT (from today) and 5.4-STABLE and I see this problem only with
> Is there any new features in -current tcp stack which may be incompatible
> with FreeBSD 4.x?
No, not in principle, and ideally also not in practice.
Sounds like a bit more diagnosis is needed, though. The first thing we should
try to determine if this is a problem with a device driver, the network stack,
If you run ping on one terminal to the local router, does it experience
problems at the same time as other applications? I.e., does ftp stallage
align with ping stallage?
Are there any console messages suggesting driver problems, such as messages
about interrupts, timeouts, and so on?
If you run "vmstat -i", is there any device with an extraordinarily high
interrupt rate (second column over 10000 or so)?
Could you try doing your network tests directly with the local router and
avoid using the wide area network? This would help avoid having wide area
issues affect your testing, and also demonstrate whether or not you can
reproduce it in a purely local setup (much easier to debug).
Robert N M Watson
University of Cambridge
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