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... > _______________________________________________ > Soekris-tech mailing list > [email protected] > http://lists.soekris.com/mailman/listinfo/soekris-tech > _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
