Date: Sun, 14 Sep 2014 10:07:28 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-stable@freebsd.org Subject: Status update - ZFS "stalls" and other misbehavior Message-ID: <5415AF30.9060209@denninger.net>
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This is a cryptographically signed message in MIME format. --------------ms010706000609040909030708 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Those of you who have seen misbehavior of various sorts while running=20 -STABLE w/ZFS filesystems may want to check out the developments in this = thread on Bugzilla. Work has continued on the candidate patch I posted back in March, and I=20 recently put forward an updated version incorporating changes made by=20 Steve as well that, at least in my testing and (thus far) on one=20 production system here, have completely eliminated the problem. More eyes looking at it and running it down are obvious better so if you = have an interest in this issue or have had problems in this area=20 (/*especially*/ if you have had system "stalls") please check it out. Those who are using my previous patch from back in March definitely want = to look at this; while the March changes did largely fix the issue they=20 did so by moving the "danger zone" further out but did not prevent the=20 ZFS code from invading system RAM to the point that it could produce=20 stalls -- it just made it much less likely. The most-recent patch, as=20 far as I've been able to determine, completely prevent it even when the=20 system is severely overstressed in terms of demanded I/O rate or when=20 the target pool is compromised (e.g. during a resilver operation.) Thanks. https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D187594 --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ --------------ms010706000609040909030708 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIFTzCC BUswggQzoAMCAQICAQgwDQYJKoZIhvcNAQEFBQAwgZ0xCzAJBgNVBAYTAlVTMRAwDgYDVQQI EwdGbG9yaWRhMRIwEAYDVQQHEwlOaWNldmlsbGUxGTAXBgNVBAoTEEN1ZGEgU3lzdGVtcyBM TEMxHDAaBgNVBAMTE0N1ZGEgU3lzdGVtcyBMTEMgQ0ExLzAtBgkqhkiG9w0BCQEWIGN1c3Rv bWVyLXNlcnZpY2VAY3VkYXN5c3RlbXMubmV0MB4XDTEzMDgyNDE5MDM0NFoXDTE4MDgyMzE5 MDM0NFowWzELMAkGA1UEBhMCVVMxEDAOBgNVBAgTB0Zsb3JpZGExFzAVBgNVBAMTDkthcmwg RGVubmluZ2VyMSEwHwYJKoZIhvcNAQkBFhJrYXJsQGRlbm5pbmdlci5uZXQwggIiMA0GCSqG SIb3DQEBAQUAA4ICDwAwggIKAoICAQC5n2KBrBmG22nVntVdvgKCB9UcnapNThrW1L+dq6th d9l4mj+qYMUpJ+8I0rTbY1dn21IXQBoBQmy8t1doKwmTdQ59F0FwZEPt/fGbRgBKVt3Quf6W 6n7kRk9MG6gdD7V9vPpFV41e+5MWYtqGWY3ScDP8SyYLjL/Xgr+5KFKkDfuubK8DeNqdLniV jHo/vqmIgO+6NgzPGPgmbutzFQXlxUqjiNAAKzF2+Tkddi+WKABrcc/EqnBb0X8GdqcIamO5 SyVmuM+7Zdns7D9pcV16zMMQ8LfNFQCDvbCuuQKMDg2F22x5ekYXpwjqTyfjcHBkWC8vFNoY 5aFMdyiN/Kkz0/kduP2ekYOgkRqcShfLEcG9SQ4LQZgqjMpTjSOGzBr3tOvVn5LkSJSHW2Z8 Q0dxSkvFG2/lsOWFbwQeeZSaBi5vRZCYCOf5tRd1+E93FyQfpt4vsrXshIAk7IK7f0qXvxP4 GDli5PKIEubD2Bn+gp3vB/DkfKySh5NBHVB+OPCoXRUWBkQxme65wBO02OZZt0k8Iq0i4Rci WV6z+lQHqDKtaVGgMsHn6PoeYhjf5Al5SP+U3imTjF2aCca1iDB5JOccX04MNljvifXgcbJN nkMgrzmm1ZgJ1PLur/ADWPlnz45quOhHg1TfUCLfI/DzgG7Z6u+oy4siQuFr9QT0MQIDAQAB o4HWMIHTMAkGA1UdEwQCMAAwEQYJYIZIAYb4QgEBBAQDAgWgMAsGA1UdDwQEAwIF4DAsBglg hkgBhvhCAQ0EHxYdT3BlblNTTCBHZW5lcmF0ZWQgQ2VydGlmaWNhdGUwHQYDVR0OBBYEFHw4 +LnuALyLA5Cgy7T5ZAX1WzKPMB8GA1UdIwQYMBaAFF3U3hpBZq40HB5VM7B44/gmXiI0MDgG CWCGSAGG+EIBAwQrFilodHRwczovL2N1ZGFzeXN0ZW1zLm5ldDoxMTQ0My9yZXZva2VkLmNy bDANBgkqhkiG9w0BAQUFAAOCAQEAZ0L4tQbBd0hd4wuw/YVqEBDDXJ54q2AoqQAmsOlnoxLO 31ehM/LvrTIP4yK2u1VmXtUumQ4Ao15JFM+xmwqtEGsh70RRrfVBAGd7KOZ3GB39FP2TgN/c L5fJKVxOqvEnW6cL9QtvUlcM3hXg8kDv60OB+LIcSE/P3/s+0tEpWPjxm3LHVE7JmPbZIcJ1 YMoZvHh0NSjY5D0HZlwtbDO7pDz9sZf1QEOgjH828fhtborkaHaUI46pmrMjiBnY6ujXMcWD pxtikki0zY22nrxfTs5xDWGxyrc/cmucjxClJF6+OYVUSaZhiiHfa9Pr+41okLgsRB0AmNwE f6ItY3TI8DGCBQowggUGAgEBMIGjMIGdMQswCQYDVQQGEwJVUzEQMA4GA1UECBMHRmxvcmlk YTESMBAGA1UEBxMJTmljZXZpbGxlMRkwFwYDVQQKExBDdWRhIFN5c3RlbXMgTExDMRwwGgYD VQQDExNDdWRhIFN5c3RlbXMgTExDIENBMS8wLQYJKoZIhvcNAQkBFiBjdXN0b21lci1zZXJ2 aWNlQGN1ZGFzeXN0ZW1zLm5ldAIBCDAJBgUrDgMCGgUAoIICOzAYBgkqhkiG9w0BCQMxCwYJ KoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0xNDA5MTQxNTA3MjhaMCMGCSqGSIb3DQEJBDEW BBQFUH0cUeP+Mh5BtMmadScnAASMOjBsBgkqhkiG9w0BCQ8xXzBdMAsGCWCGSAFlAwQBKjAL BglghkgBZQMEAQIwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMCAgFA MAcGBSsOAwIHMA0GCCqGSIb3DQMCAgEoMIG0BgkrBgEEAYI3EAQxgaYwgaMwgZ0xCzAJBgNV BAYTAlVTMRAwDgYDVQQIEwdGbG9yaWRhMRIwEAYDVQQHEwlOaWNldmlsbGUxGTAXBgNVBAoT EEN1ZGEgU3lzdGVtcyBMTEMxHDAaBgNVBAMTE0N1ZGEgU3lzdGVtcyBMTEMgQ0ExLzAtBgkq hkiG9w0BCQEWIGN1c3RvbWVyLXNlcnZpY2VAY3VkYXN5c3RlbXMubmV0AgEIMIG2BgsqhkiG 9w0BCRACCzGBpqCBozCBnTELMAkGA1UEBhMCVVMxEDAOBgNVBAgTB0Zsb3JpZGExEjAQBgNV BAcTCU5pY2V2aWxsZTEZMBcGA1UEChMQQ3VkYSBTeXN0ZW1zIExMQzEcMBoGA1UEAxMTQ3Vk YSBTeXN0ZW1zIExMQyBDQTEvMC0GCSqGSIb3DQEJARYgY3VzdG9tZXItc2VydmljZUBjdWRh c3lzdGVtcy5uZXQCAQgwDQYJKoZIhvcNAQEBBQAEggIAkQ4PivEKPEQjLFTVNYY4S8++CfM0 fPsZpROuVZTHRnkWFLBCKQQlwLXVsFXtubBirXZvzdgAqQPIW7zoHIYOUObaP7PmxG+eBpid LdvdNL2Wh75KZtIuQAJKjE5RTpGEVdT1BTj3iCKs8ez9bLrhUd0kC37T4SW/ErfSHt3kuKQE LW2+JclWvvG/uxmBD8lptC18W/SW3YJ2RiXdGMG3PexyjNqE62UQyimoqdTe6bqGuymnwkVk OhQNwdRXYhlaPWtxtu2ZpnFcL+gQo3VxkFCcKKSilrIzwGtTkfe75h4rfUQ7yznZIln2JDpc 0826CFl5Ud0a2DE4M4j5315asVDnX+rMOeXdGU2Bejz3NQkUNd/G/gb6Ttc/zHnQB7ireQkm 4zRGDindAowHKw/dPYTNLlIGF0v31J4ieYkcQ2dfMAgSlDh9hRLs59mher7Fpf/vzwHdts2v YrBurFedfQMtcb1f5/snhXfs6qWT0pHG3yuXa4T1a6PlwzWFBFh7OgQZ5JoFtF98oK+Z/vYh 7y7wVozcSBYXoZjN+vAl0bBRFO/B4mOZ2ZhG0tgvGgryT4HDiO6XQYweFuRTT8YCB+I+rbZX NkWtSfVnUruMAM2DIxuUSXpOfyuIr6uoNekRLqof4+CuNTWTVlcrUl9Dvqe8BVoqUuq+v8/k pp24J3oAAAAAAAA= --------------ms010706000609040909030708--
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