Hi, I have now a new questions. I had compiled kernel from your git (it doesnt have functional btrfs driver probably, because of kernel panic when mounting btrfs partition from fstab at startup). I am running it right now. I see sysfs interface to bcache. I had compiled make-bcache tool. Here I get stucked. According to http://bcache.evilpiepirate.org/GettingStarted and also according to documentation in Documentation/bcache.txt I should run something like this: make-bcache -b128k /dev/sde When I run this command (with 512k param), it will give me this error: blacktroja bcache-tools # ./make-bcache -b512k /dev/sda1 Must specify one of -C or -B blacktroja bcache-tools # I have had a look at make-bcache implementation and <delete>as Iam sw engineer I dont like it (I dont like also many of my own codes).</delete> I get lost in it. It seems that I should give it one of parameter B or C. If I give it C, it will affect bucket size. If Ill give it B, it will affect bucket size and some version field in some structure. I think that it will create writethrough or writeback cache from device. Is this right? Questions: 1. What parameter should I use, if I want cache (write-back) my root filesystem located on top of raid (/dev/md2)? 2. Is it possible to cache root file system in write-back style? (yes, I found an answer on bcache web. I hope, initramfs wont kill me till new year...) 3. What to do in shutdown script to be all right? (all dirti blocks from writeback device copied to main device. So I can on next boot omit using cache -> if any problems setting up cache in initramfs) 4. Can I register 3 partitons of single ssd disk as three cache devices and associate them with concrete filesystems? (so for example /home partition will be cached on 5G cache partition and / partition will be cached on 10G cache partition) (I think this is not possible right now) PS: I want to set up cache and try to make chart/graph for booting times of my desktop. I hope, it will be lovering after some reboots. If anybody want to catch any other parameter than booting time, let me know. Have a nice feriae days, -- LuVar ----- luvar@xxxxxxxxxxxx wrote: > Hi, > ----- "Kent Overstreet" <kent.overstreet@xxxxxxxxx> wrote: > > > On 12/16/2010 11:39 PM, LuVar wrote: > > > Hi, > > > > > > I have started an installation process of bcache. Till now I was > (as > > an beginner foo in this type of tasks) able only to checkout (clone) > > an git repositories. Second one has tools. I had compiled them > without > > problem. > > > > > > Iam having some troubles with second one repository. I had > > downloaded it (~317MB) and it appears to be an linux kernel. Iam > > running 2.6.34-gentoo-r12 kernel now and I want to keep this kernel > > and apply to its sources just patch, witch will add bcache > > functionality. Is it possible? > > > > Just do a git diff v2.6.35...HEAD to get a patch. If that applies > > cleanly against your gentoo kernel you should be good to go. > > Sorry, Iam too lame in this area. Would you mind to send me exact > commands which to run? ("git diff v2.6.35...HEAD" complained something > about unknown version). I have now 2.6.36 kernel (which have some > cache capability mentioned in > Documentation/filesystems/caching/cachefiles.txt) in /usr/src/linux > directory (symlinked). Your git repository I have cloned in my home > dir. > > PS: In few minutes Iam going to try your "TRIM whole ssd disk" script > after running first iozone test on my new disk. > > Have a nice Christmas time to all. (especially to them, who had bought > a new ssd disk to himself :) -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
