On 06/10/2013 10:01 AM, Alex Shi wrote: > On 06/10/2013 09:49 AM, Gu Zheng wrote: >> On 06/07/2013 03:20 PM, Alex Shi wrote: >> >>>> They are the base values in load balance, update them with rq runnable >>>> load average, then the load balance will consider runnable load avg >>>> naturally. >>>> >>>> We also try to include the blocked_load_avg as cpu load in balancing, >>>> but that cause kbuild performance drop 6% on every Intel machine, and >>>> aim7/oltp drop on some of 4 CPU sockets machines. >> Hi Alex, >> Could you explain me why including the blocked_load_avg causes >> performance drop ? > > > Thanks for review! > > the 9th patch has few explanation. like, after the only task got into > sleep in a CPU, there is only blocked_load_avg left, it looks quite big > in short time. that, block it get tasks before sleep, drive task to > other cpu in periodic balance. So, it cause clear load imbalance. >
Got it. Thanks very much for your explanation.:) Best regards, Gu -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
