On Fri, 2007-01-19 at 09:20 -0800, Christoph Lameter wrote: > On Fri, 19 Jan 2007, Peter Zijlstra wrote: > > > + /* > > + * NFS congestion size, scale with available memory. > > + * > > Well this all depends on the memory available to the running process. > If the process is just allowed to allocate from a subset of memory > (cpusets) then this may need to be lower. > > > + * 64MB: 8192k > > + * 128MB: 11585k > > + * 256MB: 16384k > > + * 512MB: 23170k > > + * 1GB: 32768k > > + * 2GB: 46340k > > + * 4GB: 65536k > > + * 8GB: 92681k > > + * 16GB: 131072k > > Hmmm... lets say we have the worst case of an 8TB IA64 system with 1k > nodes of 8G each.
Eeuh, right. Glad to have you around to remind how puny my boxens are :-) > On Ia64 the number of pages is 8TB/16KB pagesize = 512 > million pages. Thus nfs_congestion_size is 724064 pages which is > 11.1Gbytes? > > If we now restrict a cpuset to a single node then have a > nfs_congestion_size of 11.1G vs an available memory on a node of 8G. Right, perhaps cap this to a max of 256M. That would allow 128 2M RPC transfers, much more would not be needed I guess. Trond? - 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/
