Jeff Gold wrote:
Does it make sense that enabling a serial console would reduce the
bandwidth of a SCSI disk by more than a factor of ten? This seems crazy
to me but there's no arguing with empirical facts. I have an IBM x345
system on which I installed an unmodified 2.6.16.20 kernel built with
gcc-4.0.2-8.fc4 (the kernel configuration file I used can be found at
http://augart.com/jgold/kconfig). With the control kernel command line
I get about 70 MB/sec with hdparm -t but when I add "console=ttyS0,9600
console=tty0" I get about 1.6 MB/sec instead.
This can happen if there are kernel messages being printed on the serial console.
If all is quiet, I would expect things to be as fast as normal elsewhere.
-ml
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