Ken Mandelberg writes: [packet loss with Ray 3 from Linux Nehalem] What exactly is utcapture displaying as drops, and how can I get more info about where the problem is.
We have only Ray 1 and 2, but packet loss of the size you've reported would make our Rays rather unresponsive. In our case, Cisco and Sun blamed eachother, but the basic issue is apparently inability of the switch to buffer properly (as described in the SRSS docs http://wikis.sun.com/display/SRSS4dot2/Home). The full story must be more complicated in our case, as we have a second subnet where things work very well even though the "troublesome" switches are still involved. For the network with huge loss, we had only a few machines and convinced networking to wire directly to us. This list has a pile of posts on this issue, and no solutions other than to find new switches. You can identify this problem by connecting directly to the server with a cheap switch (we used a $50 Netgear). On Solaris, setting the timer tick was effective in reducing loss. Perhaps not all of this applies to your Ray 3, and we use Solaris (most tests were with the Sun X4200) rather than Linux for the server. We are Gb/s into the switch, but the Ray 1 and 2 are 100 Mb/s. --Darrel Hankerson _______________________________________________ SunRay-Users mailing list [email protected] http://www.filibeto.org/mailman/listinfo/sunray-users
