Date: Thu, 02 Sep 1999 10:40:30 -0700 From: Nick Sayer <nsayer@sftw.com> To: freebsd-hackers@freebsd.org Subject: CFD: "bogomips" CPU performance metric Message-ID: <37CEB68D.848BDAF8@sftw.com>
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This is a cryptographically signed message in MIME format. --------------msFCD11122A29DD0C92CB12590 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Linux generates a meric of CPU performance as a byproduct of calibrating a delay loop. We don't require doing any such thing, and so adding it would be purely cosmetic. However, I allege that cosmetic things aren't in and of themselves evil, so long as they don't break anything in the process. I would like to generate a number that will hopefully be reasonably compatible with the one Linux spits out. The best method I have come up with is to have a similar (the same?) count down loop in assembler. Have it count down from 1,000,000 and see how much nanotime() has gone by. NANSPERSEC/nansused = bogomips. A 1 bogomips machine will take an extra second to do this (anything likely to be even able to run FreeBSD should exceed 1 BM - yes, ha ha), and a kBM CPU can do it in 1 ms. Perhaps in the future a prescaler might be required, but this whole thing is just really chrome anyway. Would anyone scream and projectile-vomit if I added this to identcpu.c? --------------msFCD11122A29DD0C92CB12590 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIIcAYJKoZIhvcNAQcCoIIIYTCCCF0CAQExCzAJBgUrDgMCGgUAMAsGCSqGSIb3DQEHAaCC BhwwggLbMIICRKADAgECAgMBQOowDQYJKoZIhvcNAQEEBQAwgbkxCzAJBgNVBAYTAlpBMRUw EwYDVQQIEwxXZXN0ZXJuIENhcGUxFDASBgNVBAcTC0R1cmJhbnZpbGxlMRowGAYDVQQKExFU aGF3dGUgQ29uc3VsdGluZzEpMCcGA1UECxMgVGhhd3RlIFBGIFJTQSBJSyAxOTk4LjkuMTYg MTc6NTUxNjA0BgNVBAMTLVRoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBSU0EgSXNzdWVyIDE5 OTguOS4xNjAeFw05OTA4MTgxNzAxMzFaFw0wMDA4MTcxNzAxMzFaMFwxDjAMBgNVBAQTBVNh eWVyMREwDwYDVQQqEwhOaWNob2xhczEXMBUGA1UEAxMOTmljaG9sYXMgU2F5ZXIxHjAcBgkq hkiG9w0BCQEWD25zYXllckBzZnR3LmNvbTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEA zcenl3wCRQ4jtj4fFkMbXSt3zLHjqoJQrphXIHLz5Jc5DgLnxNjcNOpOT+I2kRn+1DB0oz23 0fX+M0mDYE6zVNYETeEaO5Kbn9hBGcodsSUbsDPnzeDP5DzIiwgjXQaMbO6QIwwbg01+PEiD zIk40Dg4DkVSurlMilN7vD8T88UCAwEAAaNNMEswGgYDVR0RBBMwEYEPbnNheWVyQHNmdHcu Y29tMAwGA1UdEwEB/wQCMAAwHwYDVR0jBBgwFoAU/j5gnGuMD7DYM8bKxh5YsHE4teAwDQYJ KoZIhvcNAQEEBQADgYEAdqMzGTDJwhYq9MeCTP1CC8eDUVcBZ1QMvPqhzS23qNP+lIvVuVjB cfRJWrzDmYHL4ILaaeD6pHASkZtoBW2cDSC5bi2hu0dtwTAMHBDx0i573mUNGa0cWxFWHrA1 g7kOc8lY7TV9owLWIxFmNFxBPZyy0MPiPL7aFLBQH0I7o1QwggM5MIICoqADAgECAgEKMA0G CSqGSIb3DQEBBAUAMIHRMQswCQYDVQQGEwJaQTEVMBMGA1UECBMMV2VzdGVybiBDYXBlMRIw EAYDVQQHEwlDYXBlIFRvd24xGjAYBgNVBAoTEVRoYXd0ZSBDb25zdWx0aW5nMSgwJgYDVQQL Ex9DZXJ0aWZpY2F0aW9uIFNlcnZpY2VzIERpdmlzaW9uMSQwIgYDVQQDExtUaGF3dGUgUGVy c29uYWwgRnJlZW1haWwgQ0ExKzApBgkqhkiG9w0BCQEWHHBlcnNvbmFsLWZyZWVtYWlsQHRo YXd0ZS5jb20wHhcNOTgwOTE2MTc1NTM0WhcNMDAwOTE1MTc1NTM0WjCBuTELMAkGA1UEBhMC WkExFTATBgNVBAgTDFdlc3Rlcm4gQ2FwZTEUMBIGA1UEBxMLRHVyYmFudmlsbGUxGjAYBgNV BAoTEVRoYXd0ZSBDb25zdWx0aW5nMSkwJwYDVQQLEyBUaGF3dGUgUEYgUlNBIElLIDE5OTgu OS4xNiAxNzo1NTE2MDQGA1UEAxMtVGhhd3RlIFBlcnNvbmFsIEZyZWVtYWlsIFJTQSBJc3N1 ZXIgMTk5OC45LjE2MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDEpeXU1NBfCALuByF9 JL+ra44e6yAHAhWEa4/QkyQfG53uaLK5LE/pk2cXEBceoflDQSO5MKp2l7vz5/2BwLUxi/am UCZU8pUo6xmkHpcesOK4m8EEmjLQPAlsT+Q1T/B2vwATA09FCGDz/LTQkAGKEsmcun9S6iqT NTY8POQ1LwIDAQABozcwNTASBgNVHRMBAf8ECDAGAQH/AgEAMB8GA1UdIwQYMBaAFHJJwnM0 xlX0C3ZygX539IfnxrIOMA0GCSqGSIb3DQEBBAUAA4GBACzHgh8BQz4Hj+5pXKlkgvjAlq2T K8ubUNdAmoHCuqZ2nTyVQNxVweFVgnmrCimm1QzhVyg+j/m71d8Nk1iqWy2LjzPk3VgVNXZy FSm9QvRakgt3X50n25otThuCBo7SjVa7ld7bDGUF3pWeAt1TF76+/GvDGiJ6FCthvcKfXnpa MYICHDCCAhgCAQEwgcEwgbkxCzAJBgNVBAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUx FDASBgNVBAcTC0R1cmJhbnZpbGxlMRowGAYDVQQKExFUaGF3dGUgQ29uc3VsdGluZzEpMCcG A1UECxMgVGhhd3RlIFBGIFJTQSBJSyAxOTk4LjkuMTYgMTc6NTUxNjA0BgNVBAMTLVRoYXd0 ZSBQZXJzb25hbCBGcmVlbWFpbCBSU0EgSXNzdWVyIDE5OTguOS4xNgIDAUDqMAkGBSsOAwIa BQCggbEwGAYJKoZIhvcNAQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNOTkwOTAy MTc0MDMyWjAjBgkqhkiG9w0BCQQxFgQUv65xrPC7+BSrSk81caLh6TjZhowwUgYJKoZIhvcN AQkPMUUwQzAKBggqhkiG9w0DBzAOBggqhkiG9w0DAgICAIAwBwYFKw4DAgcwDQYIKoZIhvcN AwICAUAwDQYIKoZIhvcNAwICASgwDQYJKoZIhvcNAQEBBQAEgYAlH7OE1A/S+7cA7/DJJUeS mbrbOwZTznKKizkski5aCgeDTpUaTp6GLtO4wt5SZiwl6XcmI39s7khHx51XMpJ0+462b39o mH7ScmbORNC7QtDx9dmZtOe9lqXI/w99NIQEmVjxOXfPzVA7psL8hrwO+G2Ou3QM90PqpbnB YbJU4A== --------------msFCD11122A29DD0C92CB12590-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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