Re: [Asterisk-Users] Has anyone had problems with Digium TDM400P and hyperthreading?
On Friday 15 April 2005 07:45, Damian Funnell wrote: Digium have told us that a problem that we are having (with accuracy of zap interface as measured using zttest) may be due to the fact that we have a Xeon processor with hyperthreading and have suggested turning H/T off. Anyone else experienced a problem like this? No too keen about turning H/T off, as we're running the SMP RH kernel and don't really feel like replacing the kernel (and other kernel-specific bits) on the off chance that H/T is actually the problem. AFAIK, HT is not useful if your application does a lot of floating point calculations as there is only one FPU. What happens is that there is a 1-2% overhead when HT is on (for semaphores and such). IF HT does not gain more than this 1-2% you actually end up slowing things down and this is the case for floating point applications (because of only one FPU). IS asterisk floating point heavy ? Paul H -- Paul Hewlett (Linux #359543) Tel: +27 21 852 8812 Cel: +27 72 719 2725 Fax: +27 86 672 0563 -- ___ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Has anyone had problems with Digium TDM400P and hyperthreading?
[EMAIL PROTECTED] wrote on 04/15/2005 01:45:22 AM: Digium have told us that a problem that we are having (with accuracy of zap interface as measured using zttest) may be due to the fact that we have a Xeon processor with hyperthreading and have suggested turning H/T off. I've never ran Asterisk on an HT-enabled processor. However, I've had too many problems to count with HT and Linux. I turn it off on nearly every server that has it. Then again, most of my servers are not CPU bound and I couldn't care less about the performance. Also, make sure you update your motherboard's BIOS. It's responsible for updating the CPU microcode, and often the BIOS may have newer microcode than your Linux distribution. Anyone else experienced a problem like this? No too keen about turning H/T off, as we're running the SMP RH kernel and don't really feel like replacing the kernel (and other kernel-specific bits) on the off chance that H/T is actually the problem. An SMP kernel should run just fine on a single-processor box. Slower, but fine. At least, it works for me... TIm Massey ___ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
[Asterisk-Users] Has anyone had problems with Digium TDM400P and hyperthreading?
Digium have told us that a problem that we are having (with accuracy of zap interface as measured using zttest) may be due to the fact that we have a Xeon processor with hyperthreading and have suggested turning H/T off. Anyone else experienced a problem like this? No too keen about turning H/T off, as we're running the SMP RH kernel and don't really feel like replacing the kernel (and other kernel-specific bits) on the off chance that H/T is actually the problem. Thanks, Damian. FFF Managed Technology Ltd 60 Cook St P.O. 6368 Wellesley St Auckland t +64 9 356 2911 f +64 9 358 9070 m +64 21 415 297 w www.fff.co.nz ___ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
