We have a Linux cluster (half dual Intel, half Alpha). In the past we have encountered kernels that have unacceptably slow networking. I just upgraded to RH 6.1 on several node machines and then further upgraded to 2.2.14 on some frontend machines (2 Intel, 1 Alpha). Some testing has determined that the RawHide 2.2.14 kernel rpms appear to suffer the slow-network bug, whereas the kernels shipped with RH 6.1 do not. Specifically, shipping a ~20MB file with time rcp results in 2.2.14 Intel -> anywhere 0.010u 0.330s 1:12.63 0.4% 0+0k 0+0io 147pf+0w (typical) Worst case: not sure yet as I have one rcp still hung after about 25 minutes 2.2.14 Alpha -> 2.2.13 Alpha took about 7 sec wallclock 2.2.13 Alpha -> same took 0.007u 0.541s 0:02.67 20.2% 0+0k 0+0io 2569pf+0w Finally, 2.2.12 Intel -> same took about 4 sec wallclock I'm going to back out 2.2.14 from those machines on which it was installed. I have read that 2.2.12 and 2.2.13 have bugs (our intels are SMP) but we will just see whether we can get by. Networking is critical to us. Thanks, -Katherine Holcomb
What cards?
No response, closing bug. If you want to re-open it, please try the 2.2.16-3 errata kernel first. Thanks!