This is on top of for-4.10/dio, which has Christophs simplified sync O_DIRECT support and the IO poll bits.
The restriction on 4 inline vecs is removed on the sync support, we just allocate the bio_vec array if we have to. I realize this negates parts of the win of the patch for sync, but it's still a lot leaner than the old code. And it means we use the same path for any type of sync O_DIRECT, instead of potentially bouncing between the two. Second patch is adding async support for the code base. Lightly tested. Performance results, from fio: Before patch: Treads x QD IOPS usr sys ============================================= 1x1 113K 19.8% 24.6% 1x4 321K 30.9% 65.9% 4x4 759K 19.9% 42.2% After patch: Treads x QD IOPS usr sys ============================================= 1x1 116K 21.8% 20.2% 1x4 365K 25.3% 72.9% 4x4 818K 20.7% 42.3% -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
