From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <18449.4281.679002.804576@domain.hid> Date: Fri, 25 Apr 2008 00:59:05 +0200 In-Reply-To: <51B669A8A7D2914E9AB2B3F40AC6553E646F2F@afsexc01.aurora.aero> References: <51B669A8A7D2914E9AB2B3F40AC6553E646F13@domain.hid> <2ff1a98a0804230730t44382de9i813b23d235ece2e3@domain.hid> <51B669A8A7D2914E9AB2B3F40AC6553E646F19@domain.hid> <18447.31623.723753.421351@domain.hid> <51B669A8A7D2914E9AB2B3F40AC6553E646F1D@afsexc01.aurora.aero> <18447.43488.713144.166771@domain.hid> <51B669A8A7D2914E9AB2B3F40AC6553E646F21@domain.hid> <18448.11276.526008.229326@domain.hid> <48103103.7020005@domain.hid> <51B669A8A7D2914E9AB2B3F40AC6553E646F23@domain.hid> <2ff1a98a0804240730w36d69599q8ed98c1657365cb@domain.hid> <51B669A8A7D2914E9AB2B3F40AC6553E646F2A@afsexc01.aurora.aero> <18448.49233.523862.911803@domain.hid> <51B669A8A7D2914E9AB2B3F40AC6553E646F2F@afsexc01.aurora.aero> From: Gilles Chanteperdrix Subject: Re: [Xenomai-help] serial port overrun problem RT TASK geode latencies too high List-Id: Help regarding installation and common use of Xenomai List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Karch, Joshua" Cc: xenomai@xenomai.org, Jan Kiszka Karch, Joshua wrote: > Gilles, > > The framebuffer support was added to the kernel, and magically the latency is now down to the 1300 range. I modprobed the timerbench module and so the number 1340 is the worst I've seen. The next thing to do is to play around with the outb and SMI. I got to the point where I haven't found any errors in a two minute test. 1300 is still way too high. A normal latency is something less than 100us, probably even less than 50us. -- Gilles.