On Tue, July 10, 2012 12:33 am, Chris Ball wrote: > Hi, > > On Tue, Jul 10 2012, merez@xxxxxxxxxxxxxx wrote: >>> Sorry, I don't have a copy of the eMMC 4.5 spec -- is PACKED_EVENT_EN >>> a one-time programmable fuse on the eMMC, like BKOPS_ENABLE was? >> >> No, it's not. > > Excellent, thanks. > > I've pushed both v8 patches to mmc-next. Before pushing it up to Linus, > I'd like to get a better idea of the variety of performances differences > seen using packed writes -- has it been tried on devices from multiple > eMMC vendors, and multiple host controller vendors? Can we try to build > up a quick table of results, with a standard test like iozone, to check > that we've got decent test coverage? Seungwon suggests using: > > iozone -az -i0 -I -s 10m -f /target/test -e > > I'm also worried about how much code this is adding, but I agree that > it's worth it if the performance benefits are as described. > > Thanks, > > - Chris. > -- > Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/> > One Laptop Per Child > -- Hi Chris, I suggest to also use lmdd as a benchmark test for write packing, since write packing is mostly beneficial in long sequential operations. It can be used as follows: lmdd if=internal of=/data/file1 bs=128k count=3000 Thanks, Maya -- Sent by consultant of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
