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#1
05-30-05, 10:33 PM
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I'm trying to set up Unison to sync backups on a small LAN. It all works
fine, except that the transfer rate is very slow compared to the normal speed of the LAN. The PC's are both using Unison on SuSE 9.2, connected by SSH. I'm getting about 80KB/sec on a 100Mb/sec LAN that normally manages about 10MB/sec over NFS. Is the lack of speed due to ssh or to Unison? Is there any way to tweak whichever is causing the slowdown to improve matters? Thanks, Neil Lewis |
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#2
05-30-05, 11:06 PM
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neil lewis wrote:
> Is the lack of speed due to ssh or to Unison? Is there any way to tweak > whichever is causing the slowdown to improve matters? Well, try it without Unison and see if that makes a difference. |
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#3
06-02-05, 12:40 PM
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neil lewis wrote:
> I'm trying to set up Unison to sync backups on a small LAN. It all works > fine, except that the transfer rate is very slow compared to the normal > speed of the LAN. > > The PC's are both using Unison on SuSE 9.2, connected by SSH. I'm > getting about 80KB/sec on a 100Mb/sec LAN that normally manages about > 10MB/sec over NFS. With "connected by SSH" you mean sftp/scp? Ssh may be your problem, using software encrypted connections to transfer big files is far from ideal. There are transmission overheads and obviously there is a huge cpu load imposed by encryption. |
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#4
06-02-05, 01:41 PM
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Brownout <brownout> wrote:
> neil lewis wrote: >> I'm trying to set up Unison to sync backups on a small LAN. It all >> works fine, except that the transfer rate is very slow compared to >> the normal speed of the LAN. >> >> The PC's are both using Unison on SuSE 9.2, connected by SSH. I'm >> getting about 80KB/sec on a 100Mb/sec LAN that normally manages about >> 10MB/sec over NFS. > With "connected by SSH" you mean sftp/scp? > Ssh may be your problem, using software encrypted connections to > transfer big files is far from ideal. There are transmission overheads > and obviously there is a huge cpu load imposed by encryption. ssh doesn't imply encryption. It works quite well with "none" as the encryption (if compiled with "none" as one of the ciphers, of course). If you still want encryption, but faster, try "arcfour" as the encryption cipher. It's faster than blowfish and MUCH faster than 3des and aes. For an additional speed boost, if you seldom or never use the ~ escape to command mode (if you just asked "what's that?", you don't use it), place "EscapeChar none" in your .ssh/config file. Add "-e ~" to the command line for the few times you might actually want it. Regards, |
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Speed issues with SSH