On 19/08/11 21:13, Lennart Sorensen wrote: [...] > /dev/sda: > Timing cached reads: 512 MB in 2.00 seconds = 255.59 MB/sec > Timing buffered disk reads: 134 MB in 3.01 seconds = 44.49 MB/sec > > /dev/mmcblk0: > Timing cached reads: 490 MB in 2.00 seconds = 244.49 MB/sec > Timing buffered disk reads: 36 MB in 3.09 seconds = 11.63 MB/sec 44 MB/s is surprisingly slow for SATA; that's (anecdotally) about what the TrimSlice gets through its emasculated SATA-via-USB interface. For comparison, my SheevaPlug gets: /dev/sda: Timing cached reads: 568 MB in 2.00 seconds = 283.81 MB/sec Timing buffered disk reads: 78 MB in 3.06 seconds = 25.50 MB/sec /dev/mmcblk0: Timing cached reads: 564 MB in 2.00 seconds = 281.88 MB/sec Timing buffered disk reads: 56 MB in 3.02 seconds = 18.57 MB/sec /dev/sda is a 64MB Kingston SSD (feeling, I expect, extremely frustrated at being hooked up via USB). Interesting that the cache read figure is faster on the SheevaPlug, isn't it? [...] > MEMORY INDEX : 5.943 > INTEGER INDEX : 5.664 > FLOATING-POINT INDEX: 1.669 [...] > I guess that's quite a bit faster than your sheevaplug then. Especially > on floating point. No idea if the default gcc settings the makefile > used are even ideal. Memory's about twice as fast, integer about 20%. Not as much difference as I would have thought... I compiled mine with -O3. Anyway, thanks very much --- interesting to see the figures. -- ┌─── ｄｇ＠ｃｏｗｌａｒｋ．ｃｏｍ ───── http://www.cowlark.com ───── │ │ "I have a mind like a steel trap. It's rusty and full of dead mice." │ --- Anonymous, on rasfc
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