218798 2009-12-15 15:01:56 +0000 kio_sftp is much slower than command line scp 2011-03-25 09:43:00 +0000 1 1 10 Unmaintained kio sftp unspecified openSUSE Linux RESOLVED DUPLICATE 254865 NOR normal --- 1 todor asn a alessandro-ghersi alpha_one_x86 alvaro.aguilera david kernelcruncher muziofg senjas vojta.d xia_nai 52 oldest_to_newest 880307 0 todor 2009-12-15 15:01:56 +0000 Version: (using KDE 4.3.1) Compiler: gcc version 4.4.1 [gcc-4_4-branch revision 150839] (SUSE Linux) Target: x86_64-suse-linux OS: Linux Installed from: openSUSE RPMs uploading a file to a server on the lan runs at about 1MB/s through dolphin's sftp. when using command line scp to the same server the speed is 10MB/s. the lan is 100 Mbit/s. the sftp ioslave is underutilizing the bandwidth to the point of being unusable for large files. this might be caused by explicit setting of the socket write buffer size to some small value (which disables the kernel autotuning) or by using small buffer when reading the local file. 880431 1 asn 2009-12-15 21:26:42 +0000 The reason is that the old kio implementation and the current sftp implementation in libssh is a blocking IO. We are working on this so you have to wait for the next libssh version. 880644 2 asn 2009-12-16 09:34:35 +0000 *** Bug 218845 has been marked as a duplicate of this bug. *** 884053 3 tommi.tervo 2009-12-21 13:11:04 +0000 *** Bug 219532 has been marked as a duplicate of this bug. *** 992424 4 asn 2010-07-21 16:35:12 +0000 *** Bug 245204 has been marked as a duplicate of this bug. *** 992426 5 asn 2010-07-21 16:35:30 +0000 *** Bug 239824 has been marked as a duplicate of this bug. *** 1020367 6 51758 lorenzph 2010-09-17 15:28:16 +0000 Created attachment 51758 Use sftp_async_read to speed up get requests The attached patch uses sftp_async_read to speed up the sftp kioslave. Preliminary testing showed that the transfer speed locally increased from ~3MByte/s to 18-20 MByte/s. It should apply cleanly to trunk (r1152597) but was developed against the KDE 4.5 branch. Let me know if there are any issues with the patch and I will try to fix them. 1020666 7 asn 2010-09-18 10:57:46 +0000 Philip: Thank you very much for your patch! I haven't implemented this yet cause we plan to have complete async API in libssh 0.5. I think the concept will be much the same how to use it. So it makes probably sense to apply it now. I will talk to Aris how the API should look like in libssh 0.5, review your patch carefully and come back to you. 1028850 8 asn 2010-10-07 12:25:02 +0000 *** Bug 253430 has been marked as a duplicate of this bug. *** 1047700 9 andresbajotierra 2010-11-21 18:10:35 +0000 *** Bug 246557 has been marked as a duplicate of this bug. *** 1047713 10 andresbajotierra 2010-11-21 18:20:47 +0000 *** Bug 240814 has been marked as a duplicate of this bug. *** 1100961 11 a 2011-03-25 05:26:51 +0000 4.6.1 is still infected with the issue. 1100962 12 a 2011-03-25 05:28:29 +0000 *** This bug has been confirmed by popular vote. *** 1101001 13 asn 2011-03-25 09:43:00 +0000 *** This bug has been marked as a duplicate of bug 254865 *** 51758 2010-09-17 15:28:16 +0000 2010-09-17 15:28:16 +0000 Use sftp_async_read to speed up get requests kio_sftp_use_sftp_async_read.patch text/plain 8774 lorenzph SW5kZXg6IGtpb3NsYXZlL3NmdHAva2lvX3NmdHAuY3BwCj09PT09PT09PT09PT09PT09PT09PT09 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