Re: NTP dumps Linux, film at 11. [Fwd/FYI]

Alan Cox (
Wed, 2 Dec 1998 18:43:43 +0000 (GMT)

> So the issue is basically an issue of specific drivers (as tytso said),
> not of any new locking mechanism per se. If a driver causes bad interrupt
> latency, it's WAY too easy to just blame the io-lock, but let's not do
> that. 2.1.x is more parallel, and needs more thought, and not all drivers
> have been trivial to adjust for that.

Something is dropping the I/O performance across multiple controllers badly
from 2.0 to 2.1. This includes IDE, AHA1542 and Buslogic scsi combinations.
It might indeed not be the locks.

For the ISA network cards its fairly obvious where the problems are and also
extremely hard to fix to get the same results as in 2.0.x (because the hardware
itself is designed to be single threaded) - but not impossible.


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