Interesting. That might explain a problem that Mike Silbersack is seeing with the latest em driver on vmware.
I don't know of any NICs that actually choke on such frames. Nonetheless, it is silly behavior. I'll try to see if we can get this fixed before 7.2. Thanks, Kip On Wed, Apr 15, 2009 at 8:40 AM, Renaud Lienhart <ren...@vmware.com> 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. > I don't know about other virtualization stacks' behavior. > > http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/132832 > > Thanks for your time, > > Renaud > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org" > -- All that is necessary for the triumph of evil is that good men do nothing. Edmund Burke _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
