[OT] Network In Flight data sizes
Does anyone know of a tool that will help determine Internet-application performance throughput for overall data window size? My company has a client that depends on a hosted application. While only one of their offices used this app, things worked very well for them. Now that they're rolling it globally, they're noticing significant slowdowns in certain areas. We already use Akamai and some fairly extreme caching settings to keep the dead-bits to a minimum, but the dynamic parts are showing some trouble. Essentially, they're telling us that they're seeing choke points in the 8k range for throughput. We've gone through all of our equipment and assured that we're using 64k windows sizes on the send and receive sides. Still they see this. It's one of those it must be on your end discussions and we're working hard to get all the data that they request, but it's hard to quantify this in flight number that they keep touting and showing pretty graphs of. The tool that the client's group is using is Opnet IT Guru/ACE which is a fine tool... but if I can get a req for $50k for software in under 6 months, Hell may have a need for those double hockey-sticks... Any advice is much appreciated. ~ Star ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: [OT] Network In Flight data sizes
On 07/24/2007 11:46 AM, Star wrote: Does anyone know of a tool that will help determine Internet-application performance throughput for overall data window size? My company has a client that depends on a hosted application. While only one of their offices used this app, things worked very well for them. Now that they're rolling it globally, they're noticing significant slowdowns in certain areas. We already use Akamai and some fairly extreme caching settings to keep the dead-bits to a minimum, but the dynamic parts are showing some trouble. Essentially, they're telling us that they're seeing choke points in the 8k range for throughput. We've gone through all of our equipment and assured that we're using 64k windows sizes on the send and receive sides. Still they see this. It's one of those it must be on your end discussions and we're working hard to get all the data that they request, but it's hard to quantify this in flight number that they keep touting and showing pretty graphs of. The tool that the client's group is using is Opnet IT Guru/ACE which is a fine tool... but if I can get a req for $50k for software in under 6 months, Hell may have a need for those double hockey-sticks... Any advice is much appreciated. Would netpipe (http://www.scl.ameslab.gov/netpipe/) work for you? We use it for checking network bandwidth with various block sizes. -Mark ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: [OT] Network In Flight data sizes
Star writes: Does anyone know of a tool that will help determine Internet-application performance throughput for overall data window size? My company has a client that depends on a hosted application. While only one of their offices used this app, things worked very well for them. Now that they're rolling it globally, they're noticing significant slowdowns in certain areas. We already use Akamai and some fairly extreme caching settings to keep the dead-bits to a minimum, but the dynamic parts are showing some trouble. Essentially, they're telling us that they're seeing choke points in the 8k range for throughput. We've gone through all of our equipment and assured that we're using 64k windows sizes on the send and receive sides. Still they see this. It's one of those it must be on your end discussions and we're working hard to get all the data that they request, but it's hard to quantify this in flight number that they keep touting and showing pretty graphs of. The tool that the client's group is using is Opnet IT Guru/ACE which is a fine tool... but if I can get a req for $50k for software in under 6 months, Hell may have a need for those double hockey-sticks... Any advice is much appreciated. ~ Star FYI: linux should be using window size scaling to get windows larger than 64k (there's a sysctl to turn this off, but I think it's on by default). But more fundamentilly, a tcpdump/ethereal/etc.. will easially tell you the amount of data outstanding, and netstat/etc... will tell you the fullness of socket buffers. If that isn't helping you should get a capture on both sides so you can compare to make sure there isn't any proxy or evil router/firewall mucking with your tcp stream (i.e. reassemble, then add un-QoS, jitter, backpressure, shaping, random drops, etc...) Any retransmitions, SACKs, etc.. are a sign of packet loss, if you see flags or window sizes showing up magically changing from when the same packet was sent then some intermidiate device is changing them. -- Dave ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
