On Mon, 2007-06-18 at 22:12 -0700, Vernon Mauery wrote: > In looking at the performance characteristics of my network I found that > 2.6.21.5-rt15 suffers from degraded thoughput with multiple threads. The > test that I did this with is simply invoking 1, 2, 4, and 8 instances of > netperf at a time and measuring the total throughput. I have two 4-way > machines connected with 10GbE cards. I tested several kernels (some older > and some newer) and found that the only thing in common was that with -RT > kernels the performance went down with concurrent streams. > > While the test was showing the numbers for receiving as well as sending, the > receiving numbers are not reliable because that machine was running a -RT > kernel for these tests. > > I was just wondering if anyone had seen this problem before or would have any > idea on where to start hunting for the solution.
could you enable CONFIG_LOCK_STAT echo 0 > /proc/lock_stat <run your test> and report the output of (preferably not 80 column wrapped): grep : /proc/lock_stat | head or otherwise if there are any highly contended network locks listed? - Peter - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
