On 5 October 2017 at 12:55, Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx> wrote: > On Wednesday, October 04, 2017 11:48:27 AM Ulf Hansson wrote: >> [...] >> >> >> MQ code that doesn't perform and therefore we cannot switch seamlessly >> >> to MQ. >> > >> > I think that switching seamlessly to blk-mq in short/medium-term >> > is not possible (SCSI tried and failed to do so). The changes to >> > the old path are very complex and besides affecting performance >> > they also affect error recovery handling (which needs to be tested >> > properly before the switch). >> >> Agreed, and that's why I have queued up the new Kconfig option for >> enabling the blkmq path from MMC. > > This seems premature - the new Kconfig option change for "mmc-mq" should > belong to the patch adding "mmc-mq" support (otherwise it may just confuse > users who enable it). I agree! However my plan was to move forward with the CMDQ series, but I realize that I may need to drop the Kconfig patch, in case CMDQ don't make it for 4.15. Kind regards Uffe
