On Wednesday 13 May 2009, Liu Yebo wrote: > Hi, > > I've been doing some testing with SD card writes on the our > dm355 board.That looks that the performance is dismal, that > is pretty poor. i was getting speeds of around 2-3MB/s for write.
Write performance can be gated by card performance; not all cards can write very fast. A more portable test is read performance ... bad read performance indicates something you have can fix fairly easily, and which would also affect write performance (to the extent your card can write faster). Current kernels get over 9 MB/sec reads on fast cards, with no tweaking. Older kernels may need to enable the MMC bounce buffer option to get comparable throughput. If your kernel doesn't have a bounce buffer option, maybe you can upgrade. > Now i have enable high speed SD support. I don't recall ever seeing a kernel that supported that but needed to somehow "enable" it. It should just kick in automatically when it sees an SDHC card. - Dave _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
