From mboxrd@z Thu Jan 1 00:00:00 1970 From: Erik Slagter Subject: Re: USB-Storage, slow speed with sync option Date: Wed, 14 Sep 2005 12:33:33 +0200 Message-ID: <1126694013.4248.49.camel@localhost.localdomain> References: <43277485.6030802@yahoo.de> <1126690298.4248.44.camel@localhost.localdomain> <4327FB2C.5000207@yahoo.de> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=sha1; protocol="application/x-pkcs7-signature"; boundary="=-kEOZaEp/2U6Q92ajXiBl" Return-path: Received: from oldconomy.demon.nl ([212.238.217.56]:40422 "EHLO artemis.slagter.name") by vger.kernel.org with ESMTP id S932705AbVINKeI (ORCPT ); Wed, 14 Sep 2005 06:34:08 -0400 In-Reply-To: <4327FB2C.5000207@yahoo.de> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Stefan Cc: linux-ide@vger.kernel.org --=-kEOZaEp/2U6Q92ajXiBl Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Wed, 2005-09-14 at 12:27 +0200, Stefan wrote: > >>When I copy files to my USB 2.0 Stick , my transferspeed are horrible i= n > >>case I mount the device with sync option, the rates are around 50KB/s, > >>doesn't really matter how big the files are. > >>If I don't mount with option sync, then the speeds are as expected a > >>couple of MB/s > >Now do a complete benchmark and type "sync" after the cp command. > I already did that:-) >=20 > With sync option, a test directory takes about 15min to copy. > Without sync option about 20s and running command sync afterwards takes > about 5-10s. >=20 > So roughly 15min compared to 30s The problem is that with the "sync" option the metadata on the stick has be written on every block write. That is not only terribly slow (especially on a flash device), it also wears out certain sectors. Compare it to using floppy's on a MS/DOS computer. Why would you _ever_ want to use the sync mount option on a flash device? --=-kEOZaEp/2U6Q92ajXiBl Content-Type: application/x-pkcs7-signature; name=smime.p7s Content-Disposition: attachment; filename=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIGFjCCAs8w ggI4oAMCAQICAw9TczANBgkqhkiG9w0BAQQFADBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhh d3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVt YWlsIElzc3VpbmcgQ0EwHhcNMDUwODE4MTE1NDA1WhcNMDYwODE4MTE1NDA1WjBDMR8wHQYDVQQD ExZUaGF3dGUgRnJlZW1haWwgTWVtYmVyMSAwHgYJKoZIhvcNAQkBFhFlcmlrQHNsYWd0ZXIubmFt ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBANAMKW15OgreNb+Wd++Xcw6uNJUXXIfX 56u1rtTObMmbbDY2wNc4Iqwbuwaysvox3z+YElXBibE8BAyV1iMjhee4mOfAy38dGHtWDxhOGke8 VpkyY8DSWgMN5p4egTiT6YNdHW75iiQ+Vh5zMHju1UXnIqgf5zkUGkNuxYp15jLZvRDbfA5H+Sil jbZGB2fiPOJHpyI61ZidcMgdow31qm70/oe6vXxhSZLzo7OLvExE+mQHwbCSIJMN/hPTK1z0lmQ1 kkaEjHrefqIgoF9Dk/WfOtulzvR3xBzDL50GZ32BxT/OhXYe1SHEJpSM1S/aq8TBQJYwjzREWyDh 0OYsmr0CAwEAAaMuMCwwHAYDVR0RBBUwE4ERZXJpa0BzbGFndGVyLm5hbWUwDAYDVR0TAQH/BAIw ADANBgkqhkiG9w0BAQQFAAOBgQCCpzoneRQIKsUO8zSnwQ7yhJTrS/EaDibiIVrkkCbzXwCiHFAi 7nmTRF0DlLVF3Ssf97ITWT/RSdkj9Xke0OHH7724PJdfpA6OglMnx2i7IcJLzPgPjB+fOmfR0nYX UYKuzGxTOXmshLmPcwKdpFuRLLk7n+vrTAwJYJI++crhJzCCAz8wggKooAMCAQICAQ0wDQYJKoZI hvcNAQEFBQAwgdExCzAJBgNVBAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcT CUNhcGUgVG93bjEaMBgGA1UEChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmlj YXRpb24gU2VydmljZXMgRGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFp bCBDQTErMCkGCSqGSIb3DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0wMzA3 MTcwMDAwMDBaFw0xMzA3MTYyMzU5NTlaMGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUg Q29uc3VsdGluZyAoUHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwg SXNzdWluZyBDQTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAxKY8VXNV+065yplaHmjAdQRw nd/p/6Me7L3N9VvyGna9fww6YfK/Uc4B1OVQCjDXAmNaLIkVcI7dyfArhVqqP3FWy688Cwfn8R+R NiQqE88r1fOCdz0Dviv+uxg+B79AgAJk16emu59l0cUqVIUPSAR/p7bRPGEEQB5kGXJgt/sCAwEA AaOBlDCBkTASBgNVHRMBAf8ECDAGAQH/AgEAMEMGA1UdHwQ8MDowOKA2oDSGMmh0dHA6Ly9jcmwu dGhhd3RlLmNvbS9UaGF3dGVQZXJzb25hbEZyZWVtYWlsQ0EuY3JsMAsGA1UdDwQEAwIBBjApBgNV HREEIjAgpB4wHDEaMBgGA1UEAxMRUHJpdmF0ZUxhYmVsMi0xMzgwDQYJKoZIhvcNAQEFBQADgYEA SIzRUIPqCy7MDaNmrGcPf6+svsIXoUOWlJ1/TCG4+DYfqi2fNi/A9BxQIJNwPP2t4WFiw9k6GX6E sZkbAMUaC4J0niVQlGLH2ydxVyWN3amcOY6MIE9lX5Xa9/eH1sYITq726jTlEBpbNU1341YheILc IRk13iSx0x1G/11fZU8xggHvMIIB6wIBATBpMGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3 dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1h aWwgSXNzdWluZyBDQQIDD1NzMAkGBSsOAwIaBQCgXTAYBgkqhkiG9w0BCQMxCwYJKoZIhvcNAQcB MBwGCSqGSIb3DQEJBTEPFw0wNTA5MTQxMDMzMzNaMCMGCSqGSIb3DQEJBDEWBBT6a+p78UwkZuQr oUVKJjn3IIX4RzANBgkqhkiG9w0BAQEFAASCAQBMMLHzapr0hL36kPNrcFgDljN2aHlFsf7S47BP obrO32O/+rYexKgG8N0QGR1kzzdvSEuAfdMmz+RCgjMztzkkOO/gKNuSkkQ8HVRx9F50mw4SLwHV u2LD0ZZMKtA8xEDw4on/AThlEYXUu4b64zf1vUazCvSYQX/jxE313HX8EmcFavqZCBgNQAFqsprm do6tVF5OYo1GakPBLvSfnSv9jU17qPLKnUahDQDXfHaoZFrwNGsZs1YcdybjjWdeihGO8qZhbXCS zAVKhs738aiSbhBbQfzOrXvUtZbvFTKiqEZh9QVmXsIZxhF209gjboVtqdQnUWiq36Ci5S2Cw+tI AAAAAAAA --=-kEOZaEp/2U6Q92ajXiBl--