From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yaroslav Halchenko Date: Sun, 23 Nov 2003 08:52:36 +0000 Subject: Re: weird speed problem Message-Id: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org Hi. I'm currently running unstable debian with 2.4.20 smp prepackaged kernel but the problem started appearing before on RH. So I thought may be you can give me a good guess why this might happen I have a really weird problem with estimating how fast my itanium is. I have a really simple/stupid program which is the loop which iterates 1000 times around the point of iterative approximation of PI. First I've compiled it under shipped red hat... it ran 12 sec, I was happy because it took the same amount of time for 64bit amd opteron... Then I played with how fast ia32 emulation is (took it about 2-3 minutes for the same but ia32 bit compiled program). But then at some point after I recompiled it back to ia64 it started running almost as slow as ia32 though file says a.out: ELF 64-bit LSB executable, IA-64 (Intel 64 bit architecture) version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared libs), not stripped I reinstalled linux with debian... The same story - that damn program which runs fast under all other architerctures runs stupidly slow 64bit on itanium... What could I screw by checking ia32 emulation so 'thoroughly'?? What can I check? I've checked /proc/acpi/cpu but didn't find anything usefull/weird there... P.S. bogomips run from command line reports just ~400 when /proc/cpuinfo is 1400... WHAT is WRONG??? Please advise .-. =------------------------------ /v\ ----------------------------Keep in touch // \\ (yoh@|www.)onerussian.com Yaroslav Halchenko /( )\ ICQ#: 60653192 Linux User ^^-^^ [175555] Key http://www.onerussian.com/gpg-yoh.asc GPG fingerprint 3BB6 E124 0643 A615 6F00 6854 8D11 4563 75C0 24C8