From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mario Smarduch Date: Mon, 11 Nov 2002 21:46:05 +0000 Subject: [Linux-ia64] Re: +-AFs-Linux-ia64+-AF0- reader-writer livelock proble Message-Id: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org David Mosberger wrote: > >>>>> On Mon, 11 Nov 2002 14:36:38 -0600, "Van Maren, Kevin" said: > > Van> I have not looked at this, but I don't believe it is the right > Van> way to solve the problem: users who _need_ to use all > Van> the CPUs for computation would be punished just to work around > Van> a kernel implementation issue: that's like saying don't allow > Van> processes to allocate virtual memory because if the VM is > Van> over-committed by X amount the kernel deadlocks. > > Van> It would be a bad hack to limit the system-call rate just to > Van> prevent livelock. > > Certainly. I didn't suggest PRM as a way to _solve_ the livelock > problem, but since Mario asked for a method to cap CPU utilization, I > mentiond it. > > --david Absolutelly its not a method to solve the problem. As a matter of fact its just a first approach that came to mind to protect the system. It could be any other viable way before a final fix. Like I said in the previous email you're not going to sell too many high end servers to a customer aware of this issue without a contingency plan. - Mario.