Take a look at http://kernel-perf.sourceforge.net/results.machine_id=26.html First chart with volanomark benchmark. It took ~ 11% performance regression on 2.6.13-git9 and 2.6.14-rc1. It is not those two particular kernel version have the problem per se. It would've shown on 2.6.13-rc1 when default hz rate was switched to 250. Last week, I happened to audit the system and made the hz switch and the problem showed up. Hz=1000 cpu idle is about 54%, the raw throughput is 74935 msgs/sec Hz=250 cpu idle is about 58%, the raw throughput is 67246 msgs/sec I think it has something to do with the scheduler load balance. While I'm looking into schedstat and etc. Posting here for everyone to pour over the issue. vmstat/readprofle/schedstat result with 1K hz and 250 hz attached. - Ken - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
This archive was generated by hypermail 2.1.8 : 2005-09-16 10:41:16 EST