Re: why do PPP connections die with heavy disk usage?
In article <[🔎] 42DD0F2B.8080008@fgm.com>,
Daniel B. <REMOVEdanielTHIS@fgm.com> wrote:
>Does anyone know why Linux can't seem to maintain a diald-dialed serial
>PPP connection while performing lots of disk I/O, especially on a PIO-mode
>IDE disk?
Because the IDE driver turns off interrupt processing completely
when issuing commands to / reading data from the drive. With DMA,
you don't really notice, in PIO mode, you do ..
>Does the kernel not handle serial port interrupts with higher priority
>than disk interrupts to make sure that serial data doesn't overrun
>buffers?
Because the IDE driver simply turns all interrupts *off* ...
To change this, see "man hdparm", -u option.
Mike.
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