Re: scsi vs ide performance on fsync's

[dean gaudet]

On Tue, 6 Mar 2001, dean gaudet wrote:

> i assume you meant to time the xlog.c program?  (or did i miss another
> program on the thread?)
>
> i've an IBM-DJSA-210 (travelstar 10GB, 5411rpm) which appears to do
> *something* with the write cache flag -- it gets 0.10s elapsed real time
> in default config; and gets 2.91s if i do "hdparm -W 0".
>
> ditto for an IBM-DTLA-307015 (deskstar 15GB 7200rpm) -- varies from .15s
> with write-cache to 1.8s without.
>
> and an IBM-DTLA-307075 (deskstar 75GB 7200rpm) varies from .03s to 1.67s.
>
> of course 1.8s is nowhere near enough time for 200 writes to complete.

hi, not enough sleep, can't do math.  1.67s is exactly the ballpark you'd
expect for 200 writes to a correctly functioning 7200rpm disk.  and the
travelstar appears to be doing the right thing as well.

-dean

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