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 majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
