On Nov 16, 2011, at 10:04 AM, Namjae Jeon wrote: > If slab caches set to SLAB_MEM_SPREAD flags, The allocation is spread evenly over all the memory nodes instead of favoring allocation on the node local to current cpu. And why do you think this is a good thing? For mballoc in particular, the data structures are used immediately and then freed immediately --- on the local node, so using a non-local memory just makes things worse in a NUMA system. For the pageio, they are used immediately, and may end up getting freed on the same CPU if the I/O interrupt (and hence competion callbacks) happen on the same CPU that they are submitted on…. Regards, -- Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
