Alan Cox wrote:
On Thu, 1 May 2008 20:58:37 +0200
Paolo <paoletto@xxxxxxxxx> wrote:
Hello!
It seems that me and many others are experiencing poor sata performances
in the last months, probably with 2.6.20+ kernels.
an example of these problems is here:
http://ubuntuforums.org/showthread.php?p=4845777
unfortunately it seems that sata subsystem on linux is little to none
tweakable
It doesn't normally need tweaking, and the hdparm numbers show that it is
working correctly in the example you give. There may be problems higher
up the stack but the ATA layer appears to be doing just fine.
..
Yup. The drive seems to be doing fine, according to the info you've provided.
But the "-T" (big T) number looks *very* slow: 220.02 MB/sec
That number has nothing to do with the drive. Rather, it's an indication
of how fast the CPU and memory are together, and that's about 1/20 to 1/10
of a modern system.
Note that it's not a useful number in any absolute sense, but only when
compared with a "-T" value from some other system or Linux distro.
Strange.
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