I had our test/validation group attempt to repro your problem with TSO and they were unable to do so. I do not know what hardware/config ingredients in your environment are causing a problem but something odd is going on. Test suggested something like a speed mismatch, but we don't know for sure. Right now I see no evidence to suggest that its important to disable TSO. If anyone has a scenario I can reproduce I'd be happy to look further. Jack On 10/5/07, Artem Kuchin <matrix_at_itlegion.ru> wrote: > Hi! > > A couple of weeks ago i have written about TSO4 problems on em > network interface. The problem was that when TSO4 is enable > em stream send perfomace drop to about ZERO. (i cannot download > any file from ftp, i canont even get midnight commander to draw > a full screen in ssh client). Noone has found any solution and > it was decided that it was a bug in em driver. > > Today i have played with SCHED_ULE scheduler on this box > (it is 7-CURRENT, Pentium D). Adn accidentaly found out that > when SCHED_ULE is selected TSO4 does not cause any problems. > > My interface: > > em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 > options=18b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWCSUM,TSO4> > > > This is totally weird, but i'm letting everybody know it if > someone step into this problem. Viva SCHED_ULE! > > -- > Regards, > Artem > > _______________________________________________ > freebsd-current_at_freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe_at_freebsd.org" >Received on Fri Oct 05 2007 - 18:23:01 UTC
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