On Wed, 2018-08-22 at 11:42 -0600, Jens Axboe wrote: > Any chance you can try 4.18 at least? Of course, I tried the kernel.org sources now, sys-kernel/vanilla-sources-4.18.3 on Gentoo. The issue is the same. I wonder that nobody has noticed that issue that I can reproduce on many kernels since 4.13 or even older. Is it a rare combination with my bcache, luks or btrfs? Or hardware specific? Or scheduler specific, as even BFQ is not that well tested on btrfs like the default one. > Schedulers are specific to the queuing infrastructure, so certain types > will only be available with MQ and certain types will only be available > on !MQ. I noticed that. It's just a bit intransparent from the menuconfig, options don't mention if a scheduler is working on MQ or not, like CONFIG_IOSCHED_BFQ. There it's written in the description, while CONFIG_MQ_IOSCHED_KYBER has the note in the name. Actually MQ schedulers could depend on BLK_MQ to make it obvious. Best regards, Massimo
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