From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe Subject: Re: can't get bache's sequential_cutoff to work Date: Tue, 23 Jul 2013 22:38:49 +0200 Message-ID: <51EEE9D9.7090207@profihost.ag> References: <51EE9056.7030903@profihost.ag> <51EEDC73.5020101@profihost.ag> <51EEE805.7090200@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <51EEE805.7090200-2Lf/h1ldwEHR5kwTpVNS9A@public.gmane.org> Sender: linux-bcache-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jack Wang Cc: "linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Kent Overstreet List-Id: linux-bcache@vger.kernel.org Mhm works directly on block device but not with XFS on top. Am 23.07.2013 22:31, schrieb Stefan Priebe: > It works fine if do really small block writes like this: > > # dd if=/dev/zero of=/dev/bcache0 bs=100 count=5000000 > > Can anybody tell me why? > > Stefan > Am 23.07.2013 21:41, schrieb Stefan Priebe: >> It's 3.10 with bcache Updates from kent's for 3.10 branch. >> >> Stefan >> >> This mail was sent with my iPhone. >> >> Am 23.07.2013 um 18:00 schrieb Jack Wang > >: >> >>> Hi Stefan, >>> >>> Strange, I tested bcache 2 month ago, mostly bcache-3.2 branch in >>> writeback mode, it works as claimed. >>> >>> which kernel version are you using? >>> >>> Jack >>> >>> >>> 2013/7/23 Stefan Priebe - Profihost AG >> > >>> >>> Hi, >>> >>> maybe i missed something or maybe i'm just wrong. >>> >>> >>> # cat /sys/block/bcache2/bcache/sequential_cutoff >>> 512k >>> >>> # cat /sys/block/bcache2/bcache/stats_five_minute/bypassed >>> 64.3M >>> >>> # dd if=/dev/zero of=/mnt/bcache2/ttt bs=4M count=1000 oflag=direct >>> 1000+0 records in >>> 1000+0 records out >>> 4194304000 bytes (4,2 GB) copied, 11,0348 s, 380 MB/s >>> >>> # cat /sys/block/bcache2/bcache/stats_five_minute/bypassed >>> 69.3M >>> >>> I also see only IOP/s an writes go to the SSD but not to the disk >>> behind. What's wrong? >>> >>> Greets, >>> Stefan >>> -- >>> To unsubscribe from this list: send the line "unsubscribe >>> linux-bcache" in >>> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org >>> >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> >>>