On Mon, Jul 09, 2007 at 05:45:21PM +0900, Ishizaki Kou wrote: > GDTDCEIDIS flag is defined that it is for debug and should not be used.
!? Certainly, my spec doesn't say anything like this; I don't know of any other way of turning off the descriptor chain end interrupt; leaving it on hurts performance in a big way. I get the following TX performance numbers: pkt sz rate w/o patch rate w/patch (bytes) (Mbits/sec) (Mbits/sec) ------- ---------- --------- 400 503 353 200 239 88 100 122 44 60 73 26 That's not quite a 3x performance degradation. In addition, with your patch, the number of interrupts jumps from just about zero, to about 55K/second. From what I can tell, this huge interrupt rate eats up all the CPU cycles, which is why the performance drops so drasically. > We met some troubles on Celleb platform by setting this flag. > -network does not recover after ifconfig down, then up operations. Can you be more specific? I can't imagine why this flag would have anything to do with ifdown/ifup. The device open/close routines should reset all hardware state; this shouldn't make any difference. (It doesn't for me, at least). --linas - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
