On 27 November 2016 at 15:25, Alex Lemberg <Alex.Lemberg@xxxxxxxxxxx> wrote: > Hi Ulf and Linus, > > I understand your concerns about the current packed commands > support and the problem of transition to blk_mq. > But as I mentioned in previous email thread, the packed commands > feature is still in use on eMMC4.5 or eMMC5.1 devices on hosts > without SW/HW CMDQ support. > Taking this feature out meaning stop supporting one of important > performance features of eMMC devices. How do we get an improved performance from using packed-command? If this is about decreasing communication overhead, as the JEDEC spec states, we should compare against using the asynchronous request mechanism. Then is there really any noticeable improvement? > Looking forward this feature is replaced with a CMDQ, but should we > kill it for those who doesn’t have a CMDQ? Yes, I think so. >From the performance perspective, but also from that there are no users of the code, except in some vendor trees - then there are just no justification for keep maintaining this messy piece of code. [...] Kind regards Uffe -- 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
