On Thu, Apr 21, 2011 at 1:30 AM, Andrei Warkentin <andreiw@xxxxxxxxxxxx> wrote: > 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? Is this on the same board as the other log you sent? Controller is SDHCI-PXA? If you give me /sys/block/mmcblk0/device/date, I'll investigate why this improvement isn't helping you out. 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
