On 02/12/2016 07:00 PM, Mike Snitzer wrote: > On Fri, Feb 12 2016 at 11:04am -0500, > Hannes Reinecke <hare@xxxxxxx> wrote: > >> On 02/12/2016 04:26 PM, Mike Snitzer wrote: >>> On Fri, Feb 12 2016 at 10:18am -0500, >>> Hannes Reinecke <hare@xxxxxxx> wrote: >>>>> >>>> Good news is that I've managed to hit the roof for my array with the >>>> devel2 version of those patches. (And a _heavily_ patched-up lpfc >>>> driver :-) >>>> So from that perspective everything's fine now; we've reached the >>>> hardware limit for my setup. >>>> Which in itself is quite impressive; beating Intel P3700 with 16FC >>>> is not bad methinks :-) >>>> >>>> So thanks for all your work here. >>> >>> Ah, that's really good news! But devel2 is definitely _not_ destined >>> for upstream. 'devel3' is much closer to "ready". But your testing and >>> review would really push it forward. >>> >>> Please see/test: >>> http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/log/?h=devel3 >>> >>> Also, please read this header: >>> http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/commit/?h=devel3&id=65a01b76502dd68e8ca298ee6614c0151b677f4a >>> >>> Even with devel2 I hacked it such that repeat_count > 1 is effectively >>> broken. I'm now _seriously_ considering deprecating repeat_count >>> completely (adding a DMWARN that will inform the user. e.g.: >>> "repeat_count > 1 is no longer supported"). I see no point going to >>> great lengths to maintain a dm-mpath feature that was only a hack for >>> when dm-mpath was bio-based. What do you think? >> >> Drop it, and make setting of which a no-op. >> Never liked it anyway, and these decisions should really be >> delegated to the path selector. > > Sure, but my point is DM-mpath will no longer be able to provide the > ability to properly handle repeat_count > 1 (because updating the > ->current_pgpath crushes the write-side of the RCU). > Fully understood. But as I said, the _need_ for repeat_count has essentially vanished with the move to request-based multipath. > As such I've rebased 'devel3' to impose repeat_count = 1 (both in > dm-mpath.c and the defaults in each path selector). Kewl. I'll give it a go. Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@xxxxxxx +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
