Hi, I've tested the flusher slightly to see some tweak has any difference.
Pentium D (2 cores), 3GB memory, SATA HDD (no TCQ, UDMA133) [Yeah, this is native machine, not kvm] Test is "dd if=/dev/zero of=/mnt/file bs=4K count=1M" with following changes. 1) Use WRITE command for save_sb() 2) Use WRITE_SYNC command for save_sb() 3) Add FLUSH command before save_sb() As expected, for now, tux3 is slightly faster than ext4. Maybe, because we are using the write-optimized block allocation(?). And FLUSH command makes slower slightly. blocksize 512 makes slower, and increase cpu systime, because probably buffer_head overhead, especially sort of buffer_head (perf says buffer_index_cmp() is top cpu user). [ext4] 4294967296 bytes (4.3 GB) copied, 64.511 s, 66.6 MB/s real 1m4.607s user 0m0.428s sys 0m9.580s [4096 blocksize,WRITE] 4294967296 bytes (4.3 GB) copied, 63.943 s, 67.2 MB/s real 1m3.960s user 0m0.276s sys 0m7.832s [4096 blocksize,WRITE_SYNC] 4294967296 bytes (4.3 GB) copied, 63.821 s, 67.3 MB/s real 1m3.834s user 0m0.204s sys 0m7.916s [4096 blocksize,WRITE_SYNC,FLUSH] 4294967296 bytes (4.3 GB) copied, 64.006 s, 67.1 MB/s real 1m4.016s user 0m0.196s sys 0m7.840s [512 blocksize,WRITE_SYNC] 4294967296 bytes (4.3 GB) copied, 71.6808 s, 59.9 MB/s real 1m11.755s user 0m0.384s sys 0m20.048s -- OGAWA Hirofumi <hirof...@mail.parknet.co.jp> _______________________________________________ Tux3 mailing list Tux3@phunq.net http://phunq.net/mailman/listinfo/tux3
