From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4A0AE2AC.7010302@domain.hid> Date: Wed, 13 May 2009 17:09:32 +0200 From: Gilles Chanteperdrix MIME-Version: 1.0 References: <4A0AC1C8.4050006@domain.hid> <4A0AC3F9.9090103@domain.hid> <4A0AC8A6.1000701@domain.hid> In-Reply-To: <4A0AC8A6.1000701@domain.hid> Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai-core] Troubles with switchtest List-Id: Xenomai life and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jan Kiszka Cc: xenomai-core Jan Kiszka wrote: > Gilles Chanteperdrix wrote: >> Jan Kiszka wrote: >>> Hi Gilles, >>> >>> I'm currently facing a nasty effect with switchtest over latest git head >>> (only tested this so far): running it inside my test VM (ie. with >>> frequent excessive latencies) I get a stalled Linux timer IRQ quite >>> quickly. System is otherwise still responsive, Xenomai timers are still >>> being delivered, other Linux IRQs too. switchtest complained about >>> >>> "Warning: Linux is compiled to use FPU in kernel-space." >>> >>> when it was started. Kernels are 2.6.28.9/ipipe-x86-2.2-07 and >>> 2.6.29.3/ipipe-x86-2.3-01 (LTTng patched in, but unused), both show the >>> same effect. >>> >>> Seen this before? >> The warning about Linux being compiled to use FPU in kernel-space means >> that you enabled soft RAID or compiled for K7, Geode, or any other > > RAID is on (ordinary server config). By the way, I wonder how MMX accelerated software raid works on K7, since the way I understand the code, calls to kernel_fpu_begin() can not be nested. If you think they can be nested, then we can make switchtest test fpu in Linux kernel-space when these options are enabled. -- Gilles.