Joakim Tjernlund/Transmode wrote on 2014/05/06 09:49:57:
>
> Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote on 2014/05/06 09:41:12:
> >
> > On 6 May 2014 09:17, Joakim Tjernlund <joakim.tjernlund@xxxxxxxxxxxx>
wrote:
> > > Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote on 2014/05/05 22:50:39:
> > >>
> > >> On 5 May 2014 18:55, Joakim Tjernlund
<joakim.tjernlund@xxxxxxxxxxxx>
> > > 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
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