2017-09-18 10:36 GMT+03:00 shally verma <shallyvermacav...@gmail.com>: > Hi > > I wanted to test btrfs compression using fio command but somehow > during fio writes, I don't see code taking route of compression blocks > where as If I do a copy to btrfs compression enabled mount point then > I can easily see code falling through compression.c. > > Here's how I do my setup > > 1. mkfs.btrfs /dev/sdb1 > 2. mount -t btrfs -o compress=zlib,compress-force /dev/sdb1 /mnt > 3. cp <some large test file> /mnt > 4. dmesg shows print staments from compression.c and zlib.c confirming > compression routine was invoked during write > 5. now, copy back from btrfs mount point to home directory also shows > decompress call invokation > > Now, try same with fio commands: > > fio command > > fio --directory=/mnt/ --numjobs=1 --direct=0 --buffered=1 > --ioengine=libaio --group_reporting --bs=64k --rw=write --iodepth=128 > --name=test --size=10G --runtime=180 --time_based > > But it seems to write uncompressed data. > > Any help here? what's missing? > > Thanks > Shally > -- > 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
1. mount -t btrfs -o compress=zlib,compress-force -> compress-force=zlib 2. Tune fio to generate compressible data -- Have a nice day, Timofey. -- 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
