[openib-general] Re: user-mode verbs on Itanium

[Michael S. Tsirkin]

Quoting r. Grant Grundler <iod00d at hp.com>:
> Subject: Re: user-mode verbs on Itanium
> 
> On Sun, May 08, 2005 at 05:23:45PM +0300, Michael S. Tsirkin wrote:
> > Your patch initialized tstamp[0] to get_clock which still isnt right
> > since its take before post_send and not after that.
> 
> Yes, but I think I want the first measurement *before* post_send
> since it seems to measure something different that's part of the
> code path too.

I'd prefer all deltas to measure the same thing.

> I suspect it's measuring the first "TLB" miss of HCA.

I dont think so.

> I found it very interesting that the first send (or two)
> was very expensive.
> 
> grant
> 

You still see this cache warm-up with the new code.

-- 
MST - Michael S. Tsirkin