It seems to help in some workloads, makes little difference in others, and can even be less performance in yet others. Its just not a feature that is a 100% win, that's why its not on by default. Try it and see.
Cheers, Jack On Wed, Feb 29, 2012 at 5:10 AM, Rafael Ganascim <rganas...@gmail.com>wrote: > Hi list, > > I was looking in the igb driver that I use on some Intel nics > (dualport and quadport gigabit) and in the source code, the feature: > > /* > ** Header split causes the packet header to > ** be dma'd to a seperate mbuf from the payload. > ** this can have memory alignment benefits. But > ** another plus is that small packets often fit > ** into the header and thus use no cluster. Its > ** a very workload dependent type feature. > */ > > Somebody is using this feature? What's the results? > > I think that this feature can be helpfull to improve the performance, > allowing the processing of the packet headers more fastest (pfills, > routing, etc). Is this true? > > Thanks in advance. > > Rafael > _______________________________________________ > 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" > _______________________________________________ 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"
