Date: Thu, 29 Jan 2009 15:56:54 +0000 From: Richard Tector <richardtector@thekeelecentre.com> To: "Peter C. Lai" <peter@simons-rock.edu> Cc: Charles Sprickman <spork@bway.net>, freebsd-stable@freebsd.org Subject: Re: 7.1, mpt and slow writes Message-ID: <4981D1C6.6070605@thekeelecentre.com> In-Reply-To: <20090129154828.GC63236@cesium.hyperfine.info> References: <alpine.OSX.2.00.0901290351250.37588@toasty.nat.fasttrackmonkey.com> <49819672.1090208@thekeelecentre.com> <20090129154828.GC63236@cesium.hyperfine.info>
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This is a cryptographically signed message in MIME format. --------------ms070108010008050208080406 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Peter C. Lai wrote: > I am guessing this is only related to SATA drives on SAS controllers? > The only mpt hardware I have is LSILogic 1030 Ultra4 and it writes > sustained 40MB/s to my LTO-2 drives out of the box without any tweaking. Correct. When SATA drives are used instead of SAS drives on this controller it disables the write cache resulting in poor performance. The tunable was added by Scott Long to solve the problem (though at the cost of greater risk to data). Richard --------------ms070108010008050208080406 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 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIHPDCC A5owggMDoAMCAQICAQcwDQYJKoZIhvcNAQEEBQAwgYExCzAJBgNVBAYTAlVLMRYwFAYDVQQI Ew1TdGFmZm9yZHNoaXJlMQ4wDAYDVQQHEwVLZWVsZTEZMBcGA1UEChMQVGhlIEtlZWxlIENl bnRyZTEvMC0GA1UEAxMmVGhlIEtlZWxlIENlbnRyZSBDZXJ0aWZpY2F0ZSBBdXRob3JpdHkw HhcNMDYwOTI5MTQyNTM4WhcNMTAwOTI5MTQyNTM4WjCBijELMAkGA1UEBhMCVUsxFjAUBgNV BAgTDVN0YWZmb3Jkc2hpcmUxGTAXBgNVBAoTEFRoZSBLZWVsZSBDZW50cmUxFzAVBgNVBAMT DlJpY2hhcmQgVGVjdG9yMS8wLQYJKoZIhvcNAQkBFiByaWNoYXJkdGVjdG9yQHRoZWtlZWxl Y2VudHJlLmNvbTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAxAE7t9Z0xg5iVOnqE2q7 UhaRoPrygXPXnZ4bHM8P2E4VKfpCP9tmU5rqP/zDwOKwUAFZsv1yHvzMj2d4S8nTP3eC75YY pztd1tiGIUyi2O1vtQuVrcogCC0Xe8TovubsjeosoEN6kujkTLhgWKj+/jDtb0ELiSwh7NnN CoStDvcCAwEAAaOCARUwggERMAkGA1UdEwQCMAAwLAYJYIZIAYb4QgENBB8WHU9wZW5TU0wg R2VuZXJhdGVkIENlcnRpZmljYXRlMB0GA1UdDgQWBBR5NRc2TrF8Qfj9ZMKvq5m5Lh9IFTCB tgYDVR0jBIGuMIGrgBSNCaM0QC1N5Hiyb/MPAVd/ouQEEqGBh6SBhDCBgTELMAkGA1UEBhMC VUsxFjAUBgNVBAgTDVN0YWZmb3Jkc2hpcmUxDjAMBgNVBAcTBUtlZWxlMRkwFwYDVQQKExBU aGUgS2VlbGUgQ2VudHJlMS8wLQYDVQQDEyZUaGUgS2VlbGUgQ2VudHJlIENlcnRpZmljYXRl IEF1dGhvcml0eYIJAJZYbH4e6XXnMA0GCSqGSIb3DQEBBAUAA4GBABy7Pq1hPDwR2vUs9Jlh LHXE1xLe/COWwTjmZ95mnvsX6XL6eVEzuc0xE66Mf1pyFxDKXxTCBj+G/ialE9AYiXTJAAVJ uvhvkm/u1vXdlNlfQJDRnZKFxrZsIT03LIysq+Hb4qZDpQvgWUUyGib4Ze7pNXPp8HOtlTgB ICafws5LMIIDmjCCAwOgAwIBAgIBBzANBgkqhkiG9w0BAQQFADCBgTELMAkGA1UEBhMCVUsx FjAUBgNVBAgTDVN0YWZmb3Jkc2hpcmUxDjAMBgNVBAcTBUtlZWxlMRkwFwYDVQQKExBUaGUg S2VlbGUgQ2VudHJlMS8wLQYDVQQDEyZUaGUgS2VlbGUgQ2VudHJlIENlcnRpZmljYXRlIEF1 dGhvcml0eTAeFw0wNjA5MjkxNDI1MzhaFw0xMDA5MjkxNDI1MzhaMIGKMQswCQYDVQQGEwJV SzEWMBQGA1UECBMNU3RhZmZvcmRzaGlyZTEZMBcGA1UEChMQVGhlIEtlZWxlIENlbnRyZTEX MBUGA1UEAxMOUmljaGFyZCBUZWN0b3IxLzAtBgkqhkiG9w0BCQEWIHJpY2hhcmR0ZWN0b3JA dGhla2VlbGVjZW50cmUuY29tMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDEATu31nTG DmJU6eoTartSFpGg+vKBc9ednhsczw/YThUp+kI/22ZTmuo//MPA4rBQAVmy/XIe/MyPZ3hL ydM/d4LvlhinO13W2IYhTKLY7W+1C5WtyiAILRd7xOi+5uyN6iygQ3qS6ORMuGBYqP7+MO1v QQuJLCHs2c0KhK0O9wIDAQABo4IBFTCCAREwCQYDVR0TBAIwADAsBglghkgBhvhCAQ0EHxYd T3BlblNTTCBHZW5lcmF0ZWQgQ2VydGlmaWNhdGUwHQYDVR0OBBYEFHk1FzZOsXxB+P1kwq+r mbkuH0gVMIG2BgNVHSMEga4wgauAFI0JozRALU3keLJv8w8BV3+i5AQSoYGHpIGEMIGBMQsw CQYDVQQGEwJVSzEWMBQGA1UECBMNU3RhZmZvcmRzaGlyZTEOMAwGA1UEBxMFS2VlbGUxGTAX BgNVBAoTEFRoZSBLZWVsZSBDZW50cmUxLzAtBgNVBAMTJlRoZSBLZWVsZSBDZW50cmUgQ2Vy dGlmaWNhdGUgQXV0aG9yaXR5ggkAllhsfh7pdecwDQYJKoZIhvcNAQEEBQADgYEAHLs+rWE8 PBHa9Sz0mWEsdcTXEt78I5bBOOZn3mae+xfpcvp5UTO5zTETrox/WnIXEMpfFMIGP4b+JqUT 0BiJdMkABUm6+G+Sb+7W9d2U2V9AkNGdkoXGtmwhPTcsjKyr4dvipkOlC+BZRTIaJvhl7uk1 c+nwc62VOAEgJp/CzksxggMbMIIDFwIBATCBhzCBgTELMAkGA1UEBhMCVUsxFjAUBgNVBAgT DVN0YWZmb3Jkc2hpcmUxDjAMBgNVBAcTBUtlZWxlMRkwFwYDVQQKExBUaGUgS2VlbGUgQ2Vu dHJlMS8wLQYDVQQDEyZUaGUgS2VlbGUgQ2VudHJlIENlcnRpZmljYXRlIEF1dGhvcml0eQIB BzAJBgUrDgMCGgUAoIIB6TAYBgkqhkiG9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJ BTEPFw0wOTAxMjkxNTU2NTRaMCMGCSqGSIb3DQEJBDEWBBRPoArI8R+8FAzIzc6i85hwhIDg qDBSBgkqhkiG9w0BCQ8xRTBDMAoGCCqGSIb3DQMHMA4GCCqGSIb3DQMCAgIAgDANBggqhkiG 9w0DAgIBQDAHBgUrDgMCBzANBggqhkiG9w0DAgIBKDCBmAYJKwYBBAGCNxAEMYGKMIGHMIGB MQswCQYDVQQGEwJVSzEWMBQGA1UECBMNU3RhZmZvcmRzaGlyZTEOMAwGA1UEBxMFS2VlbGUx GTAXBgNVBAoTEFRoZSBLZWVsZSBDZW50cmUxLzAtBgNVBAMTJlRoZSBLZWVsZSBDZW50cmUg Q2VydGlmaWNhdGUgQXV0aG9yaXR5AgEHMIGaBgsqhkiG9w0BCRACCzGBiqCBhzCBgTELMAkG A1UEBhMCVUsxFjAUBgNVBAgTDVN0YWZmb3Jkc2hpcmUxDjAMBgNVBAcTBUtlZWxlMRkwFwYD VQQKExBUaGUgS2VlbGUgQ2VudHJlMS8wLQYDVQQDEyZUaGUgS2VlbGUgQ2VudHJlIENlcnRp ZmljYXRlIEF1dGhvcml0eQIBBzANBgkqhkiG9w0BAQEFAASBgCT+cf6gYYITade8DYdFDJ28 WYkDmoyMq20a0XgU/tqMiHmcpEEDt682xAbjjgghtwUHwfQqg9cyapv1IxHPKyw9x7OmGOA1 c1Nrl0AaGetSTcgciO5JilJm4QATN+yz+PhAz5TIOq41mW38KsmNnvAG65JRDGZlNG81qxbS 8vHuAAAAAAAA --------------ms070108010008050208080406--
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