Messages in this thread | | | From | Andreas Dilger <> | Date | Fri, 31 Aug 2001 09:31:09 -0600 | Subject | Re: 2.4.9-ac1 RAID-5 resync causes PPP connection to be unusable |
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On Aug 30, 2001 21:23 -0700, Kevin P. Fleming wrote: > OK, I see that now... and it looks like the risks associated with setting > the unmaskirq flags on my drives (none of the four drives have it set now) > are too great to be worth playing with it. I'll just not use my PPP > connection during these particularly heavy disk activity moments. Thanks for > the quick response.
There was a kernel patch (or possibly a user-space tool) which allowed one to change the "priority" of IRQs and their handlers. This was back in the 1.2 or 2.0 days, when _any_ disk or other interrupt activity might be enough to cause problems for serial connections (especially if you only had a 16450 UART (1 byte buffer) instead of a 16550 (16 byte buffer). You could make your serial interrupt (handler) take priority over disk interrupts.
Maybe Ted Ts'o or other long-time Linux folks will know what was actually called, and whether it is still applicable to modern hardware/kernel.
Cheers, Andreas -- Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto, \ would they cancel out, leaving him still hungry?" http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert
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