On Jan 7, 2013, at 11:14 AM, Daniel Kalchev <dan...@digsys.bg> wrote:
> > On Jan 4, 2013, at 4:06 PM, Fleuriot Damien <m...@my.gd> wrote: > >> >> And network cards: >> # Up a bit our intel cards parameters >> hw.em.txd=4096 >> hw.em.rxd=4096 >> hw.em.tx_int_delay=512 >> hw.em.rx_int_delay=512 >> hw.em.tx_abs_int_delay=1024 >> hw.em.rx_abs_int_delay=1024 >> > > I am curious why we need to manually set up these values. Especially the > txd/rxd -- here are few controllers supported by the em driver that can't > handle 4096 descriptors and the choice could really be made at driver attach > time.. That could also permit different em interfaces in the system (using > different chips) to have different settings. > > My belief is the auto tuning should set things up for maximum performance, > given the hardware and if someone really needs smaller queues they could just > use the tunables. > > Are there drawbacks? > > Daniel Well perhaps the code to handle auto tuning isn't present in the driver itself. I'm not a huge fan of the idea, I believe it would be rather taxing to implement all the exceptions and that some could easily be overlooked. I believe it's better to have a more user-friendly documentation and let users tune the hardware to suit their needs. _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
