From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4CB85C64.9040307@domain.hid> Date: Fri, 15 Oct 2010 15:51:32 +0200 From: Gilles Chanteperdrix MIME-Version: 1.0 References: <1281709057.650414331@domain.hid> <4C65583D.3030800@domain.hid> <1281960823.030215299@domain.hid> <4C692FC3.5040802@domain.hid> <1283531433.789315367@domain.hid> <1283590285.1709.2153.camel@domain.hid> <1287134519.029617765@domain.hid> <1287143691.028416668@domain.hid> In-Reply-To: <1287143691.028416668@domain.hid> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai-help] Very high latencies under stress testing List-Id: Help regarding installation and common use of Xenomai List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: edward.robbins@domain.hid Cc: xenomai@xenomai.org edward.robbins@domain.hid wrote: > I am also finding that tasks are frequently hanging, causing > ipipetraces with "INFO: task xxx:xxx blocked for more than 120 > seconds". Ihave just had this with apt-get update, and was previously > getting itwith grub-install. Could this be related? Yes. There is obviously an issue in your patched kernel, we need to find this first before we draw any conclusion from any other behaviour. >>From the trace you sent, it looks like it happens in the MTRR code, but it could also be an SMI, or some other bug. For debugging purposes, could you try disabling MTRRs in the kernel configuration? -- Gilles.