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CPU to slow for SCP transfer?
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CPU to slow for SCP transfer?

berndy2001berndy2001 Member
edited September 2015 in Help

Hello,

i have a vps (openvz) at hostsailor, which is solid so far, but i habe problems with scp transfer to my local machine with winscp, the transferspeed is slow (about 1MB/s) and CPU is at 100% load. Hostsailor already suspended my vps once, because of high cpu load for a few hours. Trough http i get fullspeed and cpu-usage is very low.

I did some research and changed the encryption algorithm from aes to blowfish, but that doesn´t help. Compression is turned off. Any ideas? OS is a standatd Debian 8 64bit image.

Even on my rpi2 at home i get about 5MB/s when downloading a file with scp.

thanks in advance

Comments

  • someone attack you? logs in ssh?

  • must be a very old cpu (L5 etc) SCP uses a fair amount of cpu though.

  • berndy2001berndy2001 Member
    edited September 2015

    cpu is Intel(R) Xeon(R) CPU E31240 @ 3.30GHz

    I´m running a unixbench right now, in july it was ~1500 points.

  • @berndy2001 said:

    >

    When your running the SCP, does top show that as using the CPU, and not I/O or another process.

  • berndy2001 said: cpu is Intel(R) Xeon(R) CPU E31240

    so not as old then, do you mind running a benchmark (unixbench is useless when comparing core performance) try geekbench that will give single and multi thread

    It's also possible the provider is limiting the CPU

  • century1stopcentury1stop Member
    edited September 2015

    cpu being too slow isn't possible, too "shared" maybe.......
    more likely to be network issue, ie too many vm's sharing your NIC and network speed slow/congestion

  • Are you using compression? Maybe turn it off.

  • @ricardo said:
    Are you using compression? Maybe turn it off.


    @berndy2001 said:
    Compression is turned off.

    Thanked by 1netomx
  • @berndy2001 said:
    cpu is Intel(R) Xeon(R) CPU E31240 @ 3.30GHz

    /proc/cpuinfo shows AES acceleration?

  • Thanks guys for helping me. Some solutions are very easy: restart sshd. Damn, i spent half a day to try different things.

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