Joakim Tjernlund/Transmode wrote on 2014/05/06 09:49:57: > > Ulf Hansson <[email protected]> wrote on 2014/05/06 09:41:12: > > > > On 6 May 2014 09:17, Joakim Tjernlund <[email protected]> wrote: > > > Ulf Hansson <[email protected]> wrote on 2014/05/05 22:50:39: > > >> > > >> On 5 May 2014 18:55, Joakim Tjernlund <[email protected]> > > > wrote: > > >> > I got a Micron eMMC 4.41 memory and I am trying to use the TRIM > > > function. > > >> > my EXT_CSD_TRIM_MULT is 15 which gets me a tmo of 15*300=4500 ms > > >> > Then in mmc_calc_max_discard() I have: > > >> > max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG); > > >> > if (mmc_can_trim(card)) { > > >> > max_trim = mmc_do_calc_max_discard(card, > > > MMC_TRIM_ARG); > > >> > if (max_trim < max_discard) > > >> > max_discard = max_trim; > > >> > } else if (max_discard < card->erase_size) { > > >> > max_discard = 0; > > >> > } > > >> > pr_debug("%s: calculated max. discard sectors %u for timeout > > > %u > > >> > ms\n", > > >> > mmc_hostname(host), max_discard, > > > host->max_busy_timeout); > > >> > Now mmc_do_calc_max_discard(card, MMC_TRIM_ARG) returns 0 because the > > >> > initial trim > > >> > timeout is so high, 4500 ms: > > >> > mmc0: calculated max. discard sectors 0 for timeout 2684 ms
Just a data point, if I disable TRIM in the driver so that the code falls back to ERASE I get: mmc0: calculated max. discard sectors 114688 for timeout 2684 ms Big difference! Jocke -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
