On Wed, 18 Oct 2006 17:37:36 +0200 Andi Kleen <[EMAIL PROTECTED]> wrote:
> On Tuesday 17 October 2006 06:18, John Heffner wrote: > > Stephen Hemminger wrote: > > > On Mon, 16 Oct 2006 20:53:20 -0400 (EDT) > > > John Heffner <[EMAIL PROTECTED]> wrote: > > > > >> This patch limits the amount of time you will defer sending a TSO segment > > >> to less than two clock ticks, or the time between two acks, whichever is > > >> longer. > > > > > > > > Okay, but doing any timing on clock ticks makes the behavior dependent > > > on the value of HZ which doesn't seem desirable. Should this be based > > > on RTT or a real-time values? > > > > It would be nice to use a high res clock so you don't depend on HZ, but > > this is still expensive on most SMP arch's as I understand it. > > You can always use xtime. It doesn't have better solution than jiffies > though, but it gives you real time. > > Drawback is that there is some work towards tickless kernels and with > that xtime will be more expensive again. But hopefully not by that much. > > -Andi Actually the thing to use now is ktime. It would then be compatiable with hrtimers. But it seems a bit of overkill in this case. -- Stephen Hemminger <[EMAIL PROTECTED]> - 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
