Renaud Lienhart wrote:
Hi,
We're having trouble virtualizing FreeBSD 7+ on ESX because of an issue
with the stack's TSO implementation: it sometimes generates TSO packets
whose payload size is actually smaller than the MSS.
The faulty logic is described, along with a patch, in PR #132832. It
has been opened for a while now, without any apparent activity, which
is why I'm reaching the mailing list directly.
ESX currently drops these packets as many physical nics are known to
choke on such frames, which effectively limits FreeBSD guests'
performance.
Network cards should not choke on frames with TSO but less than one MSS
worth of data. Though it's not useful to create such frames in the stack.
I don't know about other virtualization stacks' behavior.
http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/132832
Your patch should fix the issue. I don't have time to commit it and to
run the MFC process though. Maybe Kip or Jack can run that process.
--
Andre
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