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. 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.
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