Date: Sat, 20 Sep 2014 02:34:27 +0300 From: Artem Naluzhnyy <artem.naluzhnyy@gmail.com> To: freebsd-hackers@freebsd.org Subject: Deadline/NOOP-like I/O scheduler for hardware RAID controller Message-ID: <CAEGTrdL4xkSiT9sDabgcXOEeB7aX%2BjYD1CMsThCTxHDvL71OYg@mail.gmail.com>
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Hi, Will a Linux Deadline/NOOP-like I/O scheduler implementation using GEOM sched in FreeBSD have any performance improvements on hardware RAID controllers [1], SSD drives [2] or virtualization [3] like Linux has? Or there is a FreeBSD way to pass the I/O requests queue management to underlying (RAID/SSD controller or host OS) level? NOOP scheduler implementation in Linux looks quite simple [4]. [1] http://www.fishpool.org/post/2008/03/31/Optimizing-Linux-I/O-on-hardware-RAID [2] https://wiki.debian.org/SSDOptimization#Low-Latency_IO-Scheduler [3] http://www.sigops.org/sosp/sosp09/papers/hotstorage_4_boutcher.pdf [4] https://github.com/torvalds/linux/blob/master/block/noop-iosched.c -- Artem Naluzhnyy
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