[ltp] T21, what ide speed?

[ben knight]

> I am just wondering at what speeds you operate your IDE busses in the
> T21. By default even linux-2.4.9 selects idebus=33. I have experimented
> with appending "idebus=66" to the kernel commandline and so far it seems
> to work with that speed too. I have not done any elaborate performance
> comparisions. At idebus=66 setting I get:
> 
>   [root@blackbox baiti]# hdparm -tT /dev/hda
> 
> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  0.99 seconds =129.29 MB/sec
>  Timing buffered disk reads:  64 MB in  4.05 seconds = 15.80 MB/sec

On an A21, without the idebus=66, thus with the standard 33MHz, I get
the following:

leeloo:/home/bkk# hdparm -tT /dev/hda

/dev/hda:
 Timing buffer-cache reads:   128 MB in  0.99 seconds =129.29 MB/sec
 Timing buffered disk reads:  64 MB in  4.09 seconds = 15.65 MB/sec

Perhaps the thinkpad hardware doesn't support the 66MHz, so ignores it?

ben


----- The Linux ThinkPad mailing list -----
The linux-thinkpad mailing list home page is at:
http://www.bm-soft.com/~bm/tp_mailing.html