Joel Jaeggli skrev: > Trevor Talbot wrote: > >> On Dec 17, 2007, at 8:59 PM, Iustin Pop wrote: >> >> >>> On Mon, Dec 17, 2007 at 11:28:51PM +0100, Pontus wrote: >>> >>>> Oh, that sounds a bit discouraging. Isn't CF just a variant of the IDE >>>> bus, and should therefore be able to reach speeds of 33 - 133 MB/s >>>> depending on the controller. I realize that a caveat in the OpenBSD >>>> driver could slow things down, but all the way to 2MB/s ? I'm not >>>> saying >>>> you are wrong, I'm just surprised. Have you done some benchmarks? >>>> >>> FWIW, on a 5501 with DMA enabled and on Linux, using a SanDisk >>> SDCFX3-2048 (and indeed multi-sector): >>> >>> # dd if=/dev/hda1 of=/dev/null bs=128k iflag=direct >>> 377+1 records in >>> 377+1 records out >>> 49512960 bytes (50 MB) copied, 6.80798 seconds, 7.3 MB/s >>> >> Flash is not very fast in general. Spinning disks are much faster at >> sequential reads. >> >> The performance gain you always hear about with flash is actually the >> random access speed, because solid-state media doesn't have seek times. >> > > You can buy CF cards with SLC flash memory that have read/write speeds > on the order of 33-40MB/s they do ata-66 and they're actually not that > expensive. The indutrial samples I received thus far are a bit slower > than the fastest consumer flash models.... the fastest (consumer) one > I've stuck in a soekris is this one: > > http://www.transcendusa.com/Products/ModDetail.asp?ModNo=148&LangNo=0 > > sata ssds that are even faster are possible but command a substantial > price premium... > > This is what confuses me, the benchmarks and general experience of posters in this thread says that I should not expect very high speeds (which is fine, I'm don't need my router to boot blazingly fast). But the numbers given by the manufacturers are, on the cheap end, a few MB/s and, on the more expensive end, up to 45 MB/s. Are these peak speeds? Outright lies, or are they mixing bits and bytes?
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