On Thu, Apr 21, 2011 at 1:29 AM, Andrei Warkentin <andreiw@xxxxxxxxxxxx> wrote: > 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. > And you're trying this on SDHCI I presume, right? 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
