Hello, Adam. You wrote 31 августа 2012 г., 0:32:25: AVM> BUGS AVM> The vr driver always copies transmit mbuf chains into longword-aligned AVM> buffers prior to transmission in order to pacify the Rhine chips. If AVM> buffers are not aligned correctly, the chip will round the supplied AVM> buffer address and begin DMAing from the wrong location. This buffer AVM> copying impairs transmit performance on slower systems but cannot be AVM> avoided. On faster machines (e.g. a Pentium II), the performance AVM> impact AVM> is much less noticeable. Really, this is not truth. Or, to be more specific, it is not complete truth. Now if_vr copies data only for some chips (quirk VR_Q_NEEDALIGN in sources). My chips (VT6105M) don't need it, and driver doesn't copy data for them.
-- // Black Lion AKA Lev Serebryakov <l...@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"
