> > >I'm using Ubuntu(16.04) desktop version (not server) running Xorg and > >others. May be its possible its > >flushing data to disk at constant time. If you like to give it a try again > >with servers, below is the > >exact script along with its timing & multiextent output. > > Archlinux here, with my btrfs vm and browser and music player, still one > extent. > looks like I have better setup to produce single-extent files than yours :-) > Are you under heavy memory usage? > no, not as per top and free. 'top' shows mem.usage as: KiB Mem : 7092516 total, 5961796 free, 794836 used, 335884 buff/cache
where 'compiz' process uses around 2.5% of memory and 'free' command reports almost 5gb as free. May be some 'sysctl' or others needs to be adjusted on my setup? > > > >one more curious thing, is it fine to have extents with size 4096 on RAID5 > >setup? > > > > Sure, why not? > > Any size aligned to sector size is valid, no matter the profile. > > For 4K extent, RAID5/6 will do read-modify-write, which is very common. > > Thanks, > Qu > While looking into mapping from logical->physical chunks on RAID5. I was wondering how these 4KB extents will fit into 64KB data-stripe? I didn't have idea about read-modify-write, just found few wiki links on it, will check. thanks Cheers. Lakshmipathi.G -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
