Andi Kleen wrote:
Don't forget that there are benefits of not polluting the cache with the
traffic for the incoming skbs.
Is that a general benefit outside benchmarks? I would expect
most real programs to actually do something with the data
- and that usually involves needing it in cache.
As an example, an NFS server reads some data pages using iSCSI and sends
them using NFS/TCP (or vice versa).
In the I/O AT case it might make sense to do a few prefetch()es of the
userland data on the return-to-userspace code path.
Some prefetches for user space might be a good idea yes
As long as they can be turned off. Not all usespace applications want to
touch the data immediately.
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