Re: [ANNOUNCE] Withdrawl of Open Source NDS Project/NTFS/M2FS for Linux

From: Andi Kleen (
Date: Sat Sep 02 2000 - 17:28:06 EST

On Sat, Sep 02, 2000 at 04:16:47PM -0600, Jeff V. Merkey wrote:
> Uless of course you need to debug the serial driver -- then you're
> fucked.

Not quite, the gdb stub uses an private polled serial driver. The only
hook into the serial driver is very early into the interrupt to tap the
break char. As long as you debug the serial driver on a different UART
than the stub it should work fine.

> It works today, but won't in the future. At some point, real sleep
> locks will be needed for SMP tuning since you can give them prioities
> and put deadlock detection into the sleep locks for apps. Priority
> inheritance allows you to bump the priority of folks holding a bunch of
> sleep locks so they release them more quickly. SCO Unix uses them and
> that's why it's TCP-C numbers are almost 5 times what Linux's are with a
> database. You'll need them to keep Linux competitive when Caldera ships
> their SCO Unix version.

That remains to be seen. Complex locking does not necessarily look like
the true path to performance.

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