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thehailo
n00b
Joined: 11 Mar 2004
Posts: 47
Location: US
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 Posted: Thu Mar 23, 2006 6:34 pm Post subject: SFTP Transfers Cap at 1.2MBps |
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Alright, I've been looking into this for a week and haven't had any luck. I've got a Gb network: e1000's in all computers and a Netgear 8-port Gb switch. For some reason I can't figure out, every SSH file transfer caps at 1.2 MB/s. I can have six going at once, but each one caps there. Every machine's running Gentoo, either 2005.1 hardened-sources or 2006.0 gentoo-sources.
I've tried all sorts of things, from messing with sshd to formatting and rebuilding the systems (needed to anyways to change partition sizes). I've found some similar problems online and around the forum here, but nothing exactly like this and no solutions. It does tend to cap differently by the client. On a Windows XP Pro box using WinSCP it seems to cap around 900 Kb/s, while Konqueror (KDE v3.5.1) hits 1.2 MB/s. I assume since I can have several transfers going at once all at 1.2 MB/s it's an artificial cap somewhere.
Ideas?
Last edited by thehailo on Sun Jan 22, 2023 5:03 am; edited 3 times in total |
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thehailo
n00b
Joined: 11 Mar 2004
Posts: 47
Location: US
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| Posted: Sat Mar 25, 2006 1:47 am Post subject: Re: SFTP Transfers Cap at 1.2Mbps |
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N/A
Last edited by thehailo on Sun Jan 22, 2023 3:44 am; edited 1 time in total |
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EatMeerkats
Apprentice
Joined: 15 Mar 2006
Posts: 234
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| Posted: Sat Mar 25, 2006 2:29 am Post subject: |
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| How fast does it go using the commandline sftp client? I can get about 20 MB/s to a ThinkPad, which also has an e1000. The only reason it can't go any faster is because the laptop CPU can't keep up... |
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Suicidal
l33t
Joined: 30 Jul 2003
Posts: 959
Location: /dev/null
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| Posted: Sat Mar 25, 2006 3:32 am Post subject: |
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| Im not sure about winscp but alot of windows sftp stuff is crap. I wouldsay try a minimal install of cygwin and see how transfers go that way. |
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slithy
Guru
Joined: 26 Nov 2005
Posts: 321
Location: Kansas
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| Posted: Sat Mar 25, 2006 7:54 am Post subject: |
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| I have seen the 1.2MB cap also. I have only seen it when I am using Konqueror to drag and drop files from one window(sshed into remote machine) to another window(local machine). I figured it was just some sort of thing with Konqueror. With scp from terminal the cap doesn't apply and the bandwidth maxs. |
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thehailo
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Joined: 11 Mar 2004
Posts: 47
Location: US
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| Posted: Sun Mar 26, 2006 9:23 am Post subject: |
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scp does a lot better, however it still caps around 14 MB/s, well below what I'd expect from a Gb network. I do wonder why Konqueror works so much slower and why my speeds are so off what I'd expect.
Last edited by thehailo on Sun Jan 22, 2023 3:48 am; edited 1 time in total |
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think4urs11
Bodhisattva
Joined: 25 Jun 2003
Posts: 6659
Location: above the cloud
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| Posted: Sun Mar 26, 2006 10:36 am Post subject: |
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| thehailo wrote: | | scp does a lot better, however it still caps around 14MBs, well below what I'd expect from a GB network. |
Did you check the cpu utilization on both server and client during the transfer? Most probably at least one side cannot en/decrypt faster than that.
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Nothing is secure / Security is always a trade-off with usability / Do not assume anything / Trust no-one, nothing / Paranoia is your friend / Think for yourself |
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thehailo
n00b
Joined: 11 Mar 2004
Posts: 47
Location: US
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| Posted: Mon Mar 27, 2006 3:10 pm Post subject: |
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| Think4UrS11 wrote: | | thehailo wrote: | | scp does a lot better, however it still caps around 14MBs, well below what I'd expect from a GB network. |
Did you check the cpu utilization on both server and client during the transfer? Most probably at least one side cannot en/decrypt faster than that. |
Well I thought that might be part of it, so I've been monitoring system resources on both ends. The SFTP is hitting around 65% utilization. However, I've been wondering where the SFTP's HDD (7200 RPM ATA133 IDE) might start slowing things down. After more testing the best I've been able to do was about 16 MB/s in bursts and 12-13 MB/s steady.
Last edited by thehailo on Sun Jan 22, 2023 3:31 am; edited 2 times in total |
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MrUlterior
Guru
Joined: 22 Mar 2005
Posts: 511
Location: Switzerland
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| Posted: Tue Mar 28, 2006 2:04 pm Post subject: |
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Run netperf -f K between two hosts and post the results.
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slithy
Guru
Joined: 26 Nov 2005
Posts: 321
Location: Kansas
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| Posted: Tue Mar 28, 2006 6:29 pm Post subject: |
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Here is the result of netperf between the two machines I have:
| Code: | desky joel # netperf -H 192.168.1.35 -f M
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.1.35 (192.168.1.35) port 0 AF_INET
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. MBytes/sec
87380 16384 16384 10.00 64.53 |
I too can only get 1.2MB with SSH and konqueror. |
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think4urs11
Bodhisattva
Joined: 25 Jun 2003
Posts: 6659
Location: above the cloud
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| Posted: Tue Mar 28, 2006 6:59 pm Post subject: |
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fish transfer slow (max 1.2 Mb/sec vs scp 10 Mb/sec)
_________________
Nothing is secure / Security is always a trade-off with usability / Do not assume anything / Trust no-one, nothing / Paranoia is your friend / Think for yourself |
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