Hello, I recently had some problems with Xen timer and tcp congestion algorithms, especially tcp_vegas which crashes machines because it seems to measure round trip times to be zero -- and then divides by them. So I thought I play around with congestion algorithms a bit in order to if they have an effect on NFS throughput. In the end, I detected a totally different correlation: I have mounted an NFS share within domU. The share is exported from dom0 on the same physical machine. I have a routed/masq setup. Writing to the NFS share happens at approx 11 MB/s (much less than phsically possible), reading happens at 1.3 MB/s. dom0 and domU are not running *anything* else. The CPU usage is at approx 0% inside dom0 and domU. Now what I found out: the read speed goes up dramatically when I start bzip2 in dom0! Best regards, Mark _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users