very poor cygwin scp performance in some situations

[Pedro Inacio]

I'm starting to think that openssl have some performance issues on  
cygwin.
my fixed non-blocking echo_server.c with openssl is too slow when  
compared with the same code compiled on Linux.

is something like 40ms on Linux to 1040ms on Cygwin.


On 2006/03/27, at 23:32, Steven Hartland wrote:

> ----- Original Message ----- From: "Pedro Inacio"
>> I've initiated the post "select() too slow".
>> The example I've done was a non-blocking tcp echo_server.c and  
>> how  slow it was on linux compared with cygwin.
>> In fact after activation oh tcp_nodelay option the times were  
>> similar.
>> Meanwhile I've done another test, I've added ssl on top of that   
>> echo_server.c with similar results than on linux, with the   
>> tcp_nodelay set, and the results are again against cygwin binary.
>> On cygwin is too slow. I just don't know where the problem is.
>
> Thanks for that what was interesting with scp was direction had
> a large impact on performance.
> On FreeBSD from Cygwin -> FreeBSD 700KB/s
> On Cygwin from Cygwin -> FreeBSD 1.2MB/s
> On FreeBSD from FreeBSD -> Cygwin 6.4MB/s
>
> So there is definitely performance to be gained. I had a similar
> problem with a basic perl FTP script uploading from Cygwin to
> a FreeBSD machine and there simply setting the block size
> to 8K fixed the issue. Note: From FreeBSD -> FreeBSD the
> script didn't require said fix but it didn't effect it either. This
> may be something to look at as well.
>
>    Steve
>
>
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