From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Yuvraj Agarwal" Subject: RE: XEN 4.0 + 2.6.31.13 pvops kernel : system crashes on starting 155th domU Date: Tue, 27 Apr 2010 10:18:41 -0700 (PDT) Message-ID: <07df01cae62d$afb40d90$0f1c28b0$@ucsd.edu> References: <019701cae5dd$01b36e70$051a4b50$@ucsd.edu> <20100427135911.GB23625@phenom.dumpdata.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20100427135911.GB23625@phenom.dumpdata.com> Content-Language: en-us List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: 'Konrad Rzeszutek Wilk' Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Thank you for the pointer. Unfortunately, I was unable to find the message you mentioned after looking through the archives... In my current kernel config (default 2.6.31.13 pvops kernel) I don't have CONFIG_LEGACY_PTY_COUNT defined, perhaps because I have the following in the .config ? # CONFIG_LEGACY_PTYS is not set Do you think setting the variable above and setting the CONFIG_LEGACY_PTY_COUNT to a high value will help in this case? --Yuvraj -----Original Message----- From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@oracle.com] Sent: Tuesday, April 27, 2010 6:59 AM To: Yuvraj Agarwal Cc: xen-devel@lists.xensource.com Subject: Re: [Xen-devel] XEN 4.0 + 2.6.31.13 pvops kernel : system crashes on starting 155th domU On Tue, Apr 27, 2010 at 12:41:07AM -0700, Yuvraj Agarwal wrote: > Hi All, > > > > We are setting up a system with a large number of very small VMs for a > project. We worked through a number of limitations, including those > imposed by blktap2 devices and the number of dynamic IRQ (set kernel > config NR_CPUS) etc. After these changes we were able to get to 154 domUs > (!), but as soon as we start up the 155th domU the system crashes. We > edited each domU config to have one blktap2 device (the disk image) and > two virtual network interfaces each. This sounds strangly familiar. I believe somebody posted a question about this a couple of months ago on the xen-devel mailing list and found the answer. I think part of it was CONFIG_LEGACY_PTY_COUNT had to be high. But I don't remember the exact details - you might want to search the archive.