Very strange measurements

[Brecht Vermeulen]

Dear all,

oh boy oh boy, problem solved with a BIOS update (Abit KT7 motherboard)
and now everything works fine and as expected.

See attachment for the results, now around 15us latency, so it's just
perfect.

Sorry for taking your time, I didn't know that a BIOS update could make
such a performance difference...

end good, all good :-),

regards,
Brecht

Benjie Chen wrote:
> 
> i am not sure what's going on. it seems like the device is claiming
> to be busy in the slow case more often the fast case, which is weird.
> 
> what kind of tulip card were these again? may be we can purchase one
> here and try it out.
> 
> benjie
> 
> On Sat, Jul 07, 2001 at 10:39:08AM -0700, Eddie Kohler wrote:
> > Here is a summary of Brecht's data.
> >
> > POLLDEVICE                 "Slow" case     "Fast" case     Ratio
> > ========================     -----------     -----------     -----
> > Poll cycles/scheduling           101.305        60.157      1.68
> > Packets/activation                 1.000         1.002      1.00
> > Refill cycles/activation          96.418        73.514      1.31
> > Alloc cycles/activation          313.577       136.413      2.30
> > Push cycles/activation         45048.118      3688.913     12.21
> > Total schedulings            149583701        77971748      1.92
> >
> > TODEVICE                   "Slow" case     "Fast" case     Ratio
> > ========================     -----------     -----------     -----
> > Dev busy/activation              114.664           0.057  2012.239
> > Hard start/activation              0.096           0.000  3192.317
> > Pull cycles/activation           181.176          98.689     1.836
> > Clean cycles/activation          664.575         334.151     1.989
> > Free cycles/activation           617.954          77.850     7.938
> > Queue cycles/activation          267.944         131.332     2.040
> > Activations                        83639         1034375     0.081
> >
> > Note: Benjie, we should think about redesigning the stats. There is no way
> > to determine how many times ToDevice was scheduled, for example.
> >
> > Most intriguing to me are PollDevice push cycles/activation, and ToDevice
> > dev busy/activation and hard start xmit/activation. How can there be 100+
> > dev busys per activation!?!??!?!?!? Shouldn't there be at most one? (An
> > "activation" is a period where the ToDevice sent a packet: `if (sent > 0)
> > _activations++;')
> >
> > love,
> > ed
> 
> --
> benjie chen
> benjie at lcs.mit.edu
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