Re: kernels and b0xen
On Thu, Jan 23, 2003 at 13:34:06 +0100, Gabriel Paubert composed:
> On Thu, Jan 23, 2003 at 12:12:56PM +0100, Geert Uytterhoeven wrote:
> > On Thu, 23 Jan 2003 simon@nuit.ca wrote:
> > > that may be because of the smallish amount of RAM on this thing;
> > > interleaved i was getting pretty much the same ratings. it may have to
> > > do with the RAM sticks' actual ms speed rating - i have 4MB sticks @ 70
> > > ms IIRC, and some 8MB sticks @ 60 ms.
> >
> > us (microseconds), I guess?
>
> Better but not quite yet, only 3 orders of magnitude off instead of 6 ;-)
> Memory access times were already counted in nanoseconds 25 years ago.
oops, heh. i guess i forgot what the measurement was. nanoseconds seems
more correct - microseconds seems um, slow, lol.
> > BTW, I get 45 MB/s for the buffer-cache on my 66 MHz SDRAM.
>
> Looks still very low, very conservative bridge timings? This means a
> cache line read (32 bytes) every 700ns or so. Even if you dirty every
> cache line, doubling the traffic, this means 350ns per burst transfer.
you lost me there.
simon
> Regards,
> Gabriel
>
>
> --
> To UNSUBSCRIBE, email to debian-powerpc-request@lists.debian.org
> with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org
>
--
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
|UNIX is user friendly, it's just picky about who its friends are.|
*-----------------------------------------------------------------*
| ,''`. http://www.debian.org/ | http://www.nuit.ca/ |
| : :' : Debian GNU/Linux | http://simonraven.nuit.ca/ |
| `. `' | simon@nuit.ca |
| `- | PGP key: 3744 810B 50F5 187E |
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
Reply to: