Re: Speed Question|
Richard Gregory <R.Gregory,AT,liverpool,DOT,ac,DOT,uk>|
Fri, 13 Feb 2004 20:11:53 +0000|
There are a few things to check to locate this problem. First, what
machines are running the CIPE end points? Encryption takes computational
effort, the endpoints must have enough power to cope with the maximum
Also, a problem I encounter is the CIPE packet overhead. CIPE adds 54
bytes or so to each packet, so if the packets are small and there are
many of them the overhead becomes significant. To test for this you can
compare the datarate going through the CIPE interface to the datarate
through whatever the CIPE traffic runs over.
Somebody else on the mailing list was asking similar questions. He was
wondering why the datarate over CIPE varied so much in the up and down
directions and between protocols. Protocols like FTP had more throughput
than NFS. The high speced CIPE end point had higher outgoing throughput
than the lower speced endpoint. The differences were significant.
Bruce Sackett wrote:
I am running into what appears to be some slow connections across
multiple CIPE connections. Ping rates are extremely good, but data
transfer across these connections is reportedly very slow. Most
transfers across these connections are SQL queries and responses at this
point, with some file transfers. In many cases these queries are quite
large, or are many many small ones.
Any possible suggestions as to what I can check on this, or
settings/options I should look at?