Hi, I'm testing a problem with the following combination: - SB700/SB800 type controller in AHCI mode (in a HP Microserver N36L) - Seagate Barracuda 1TB 7k2 drive with NCQ I've got a fresh 256MB partition, formatted ext4, mounted barrier=1,data=ordered, write-cache enabled (hdparm -W 1 /dev/sdb) and shared over NFS. When the NFS client writes, - unpacking a source tarball, many small files, iostat reports speeds under 500kBytes/sec - dd conv=fsync, iostat reports about 50MB/sec If I set up a USB disk on the same box, with a partition formatted exactly the same way, the iostat reports the write speed (unpacking the same tarball) is over 5MBytes/sec - not so fast, but 10 times faster than the AHCI device. Is there anything I can do to troubleshoot this issue? Or should I just stop using this onboard SATA and go to something like an Adaptec 1405? Regards, Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
