On Tuesday 20 March 2007 17:20, Lennart Sorensen wrote: > > ------------------------------------------------------------------------- > >---------------------------------- 1 - LAPTOP: > > /dev/sda: > > Timing cached reads: 5788 MB in 1.99 seconds = 2901.82 MB/sec > > Timing buffered disk reads: 102 MB in 3.02 seconds = 33.78 MB/sec > > 33MB/s sounds right for a decent laptop drive. > > Very nice ram speed on that (cached reads are a memory speed test, not a > disk speed test). > Yes, of course.
> The memory performance is actually pathetic for an AMD. Are you running > single channel by any chance? Dual channel memory should get about > twice that (at least my old single core 3500+ with DDR400 does gets > 1700MB/s or so). Make sure you are using a pair of identical memory > modules and that they are installed into each channel. Using crap > DDR2-533 ram is just a bad idea of course since that will really reduce > memory performance even further. But you certainly want to be using > dual channel. Its dual channel, all right. 4 completely identical Crucial Ballistix 512MB modules covering all available slots. The BIOS reports: 2G DDR400, Dual channel, 128-bit. > It sounds like dual channel on the laptop and single channel on the > desktop. If the desktop isn't the new socket AM2 and using plain DDR > ram, then your numbers make sense for single channel memory (they are > absolutely wrong if you have two channels of memory). The desktop is socket939, bought it 11/2005. > > 2) Shouldn't the "notorious" WD raptor greatly outperform the Seagate > > when comparing single disk performance (case 3 vs. 4)? After all, the WD > > costs 2 times the price of the Seagate (or was it even more..?). > > On seek time and random acces, yes. On raw transfer rate no. The > density and hence the amount of data moving past the head in a given > amount of time is not great. After all if you run half the density at > twice the speed, you still get the same amount of data going past the > head. That's true, thanx for pointing it out. Dimitris -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
