Hello, and welcome!
Quote:
Originally Posted by KBr
...There are regular connection breakdowns during larger downloads and display of streaming content is rather jerky....Any hints on what to look for are appreciated.
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I'm wondering if a scarcity of mbufs or mbuf clusters might be possible cause. Using the -m option of netstat(1) while those packets are in transit may provide an indication of an mbuf problem or rule this out as a possiblity. Of course if the kernel exhausts mbufs completely, it will panic.
Support for OpenBSD 5.0 ceased on 1 Nov 2012 when OpenBSD 5.2 was released. Since 5.0, there have been network stack improvements including, at 5.1, "Improved vlan priority support, including mapping to interface queues" and at 5.2, "Increased TCP initial window to 14600 bytes as proposed in draft-ietf-tcpm-initcwnd." While you do not desire an upgrade it is possible that your problem has been resolved by developments implemented since 18 July 2011, when new development ceased for what became 5.0-release.
Even though 5.0 is no longer supported, you might consider posting about the problem on the misc@ mailing list; it is a larger audience and it is possible you will get better advice from more knowledgeable people, including developers. If you have not posted to OpenBSD project mailing lists before, please see
http://www.openbsd.org/mail.html for guidance.