Hi Chris, On Wed, Apr 20, 2011 at 8:44 PM, Chris Ball <cjb@xxxxxxxxxx> wrote: > Hi, > > On Sat, Apr 16 2011, Andrei Warkentin wrote: >> This is the third version of the CMD23 plumbing and host driver support >> patch set. >> >> Changes: >> 1) CMD23 support (used for features such as reliable writes) is decoupled >> from general multiblock trans through use of a quirk for affected cards. >> 2) Newer Sandisk MMC products are whitelisted along with some known good ones. All other >> MMC products do not use CMD23 for general transfers (seems like safest choice for now). >> SD products unaffected. > > Just gave this a try on SEM04G, which is in the whitelist, but didn't > see a performance increase (or decrease). What are you using for a > testcase? I'm a little wary of running mmc_test on it. :) > Can you give me the manufacturing date? This is pretty interesting. You can see an improvement even if you do something like time block writes (O_DIRECT | O_SYNC, of course). But after all synthetic tests I measured the time it took to do 40000 SQLite insertions and saw something like 30% improvement. A -- 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
