Re: Known problems with dcache?

Andrew Cagney
2003-01-10T22:36:07Z

> We don't use the straw on some targets now; Linux (need to get back to
> that patch and turn it on always!), *BSD.

Right so that 32 byte read is now cheap.

> The dcache needs some serious work if you want it to be always on.
> Last time I tested it it caused an actual slowdown. Basically, it's
> too small to be useful.
>
> #define DCACHE_SIZE 64
> #define LINE_SIZE_POWER (5)
>
> So it never stores more than 2K. LinuxThreads _overwhelms_ that, by a
> downright boggling amount.

You wouldn't know why it caused a slow down? Th 32 byte read should now
be cheaper.

Andrew