On 24 Jan, this message from [EMAIL PROTECTED] echoed through cyberspace: >> > > 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. >> >> Note these are the results of `hdparm -T', not from a real memory benchmark. >> Real memory read performance is ca. 100 MB/s, which is reasonable for >> machines >> of that age, cfr. http://home.tvd.be/cr26864/Linux/PPC/MemSpeed.html > > hm, well other than the cache on the CPU and the RAM and disk caches, i > don't have a cache per se, i.e., on mobo L2 cache. this could be making > a rather large difference. i didn't realise that until now.
This is with a 604 processor, right? Then yes, you should try to get a cheap cache DIMM from Ebay. For the 7x00/8x00 machines cache increased performance by up to 20%. Cheers Michel ------------------------------------------------------------------------- Michel Lanners | " Read Philosophy. Study Art. 23, Rue Paul Henkes | Ask Questions. Make Mistakes. L-1710 Luxembourg | email [EMAIL PROTECTED] | http://www.cpu.lu/~mlan | Learn Always. "
