On Tue, 20 Mar 2007, Shawn O. Pearce wrote:
quoted text
> 
> I tested both patches on a PowerPC G4.  (Apple PowerBook, 1.5 GHz)
> Running on Mac OS X 10.4.8.
> 
> Might be more of a Linux<->Darwin thing; perhaps my isspace is
> significantly slower than yours is...  after all my mmap runs
> like a PC from the 1980s...  ;-)

No, we do a git-specific isspace().

But yeah, a G4 will explain the thing even more than a P4 would. The G4 
really isn't a very good uarch compared to the modern x86 ones. Not 
aggressively out-of-order with deep instruction queues and I don't think 
it does basically any memop re-ordering at all. I know Apple used to claim 
that they were the fastest PC around (both with the G4 and the G5), but 
let's face it, they lied.

The closer to in-order you are, the more instruction scheduling in sw 
tends to matter.

		Linus
-
To unsubscribe from this list: send the line "unsubscribe git" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html