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CPU to slow for SCP transfer?
berndy2001
Member
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.
cpu is Intel(R) Xeon(R) CPU E31240 @ 3.30GHz
I´m running a unixbench right now, in july it was ~1500 points.
>
When your running the SCP, does top show that as using the CPU, and not I/O or another process.
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
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.
/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.