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Memory, IDE performance, idle speculation, THANKS!


I bought my Netwinder with 128 MB RAM, but can't seem to get Debian or
RedHat to recognize more than 64 MB.  Here's what dmesg has to say:

RedHat (2.0.35):
Memory: 63608/65536k available (680k kernel code, 48k reserved, 1200k

Debian (kernel-image-2.2.13-netwinder_19991215):
Memory: 63428/65536k available (1160k code, 20k reserved, 912k data, 16k

Debian (2.3.35-rmk1, image .deb in http://lyre.mit.edu/~powell/debs/):
Memory: 64MB = 64MB total
Memory: 62684KB available (1140k code, 455k data, 108k init)

Funny thing is, I compiled 2.3.35-rmk1 with
CONFIG_CMDLINE="mem=128M root=/dev/hda3 ide0=autotune ide1=autotune"
so it should see all 128M, right?  But it doesn't.  What am I missing?
Or did I get a 64M machine from Rebel, for the price of a 128M machine?

Second, using hdparm -t /dev/hda in RedHat gives 4.07 MB/sec, in Debian
2.2.13 1.59 MB/sec (!), in Debian 2.3.35-rmk1 2.63 MB/sec.  Is this
real?  Any ideas on how we might get Debian kernel 2.2/2.3 up to the
RedHat kernel 2.0 level of IDE performance?

Third, just out of curiosity, after reading about how little power the
Crusoe uses (1W for the 700 MHz version, somewhat less for 400 MHz!),
I'm wondering how it compares to the ARM?  Between that and Intel using
Celerons for their Linux web appliances, is this CPU going down?

Finally, I can't tell you how happy I was to see the new glibc!  To all
involved, thank you very very much!!

      Adam Powell                     http://lyre.mit.edu/~powell/
      Thomas B. King Assistant Professor of Materials Engineering
      77 Massachusetts Ave. Rm. 4-117         Phone (617) 452-2086
      Cambridge, MA 02139 USA                   Fax (617) 253-5418

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