Re: Pausing/resuming CPU's in DDB

[Martin Husemann <martin%duskware.de@localhost>]

On Thu, Feb 23, 2012 at 10:57:47PM +0900, Takeshi Nakayama wrote:
> How about increase the retry count in sparc64_send_ipi() ?
> 
> Ours is now 1000, but FreeBSD is 5000, OpenBSD is 10000.

Do both, or scale the retry count on cpu speed ...

If it only fails for ddb enter/exit the loop is fine, IMHO - but as we have
seen other reports of ipi sending failure during normal operation, we should
add the instrumentation Eduardo suggested and find out where we are blocked
out that long (but this is mostly orthogonal to the topic at hand).

Martin