Andi Kleen wrote:
As an example, an NFS server reads some data pages using iSCSI and sends
them using NFS/TCP (or vice versa).
For TX this can be done zero copy using a sendfile like setup.
Yes, or with aio send for anonymous memory.
For RX it may help - but my point was that most applications
are not structured in this simple way.
Agreed. But those that do care, care very much. The data mover
applications, simply because they don't touch the data, expect very high
bandwidth.
As long as they can be turned off. Not all usespace applications want to
touch the data immediately.
Perhaps. And lots of others might. Of course the simple
network benchmarks don't so the number on them look good.
There are very real non-benchmark applications that want this.
Just pointing out that it's not clear it will always be a big help.
Agree it should default to in-cache.
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