saeed bishara wrote:
(linux-nfs added to cc)
I cannot speak for the NFS server code specifically, but 32kb sounds
like a network read (or write) data size limit.
yes
Are you using TCP? Are you using NFSv4, or an older version?
I'm using NFSv3/UDP.
IMO, you definitely want TCP and NFSv4. Much better network behavior,
with some of the silly UDP limits (plus greatly improved caching
behavior, due to v4 delegations).
I found that the actual requests size was 16KB, after doing some hacks
in server&client I managed to make it 60KB, now I see better
performance, and I see that the average request size is ~130KB which
means that there is actually read-ahead. but why it's only 130KB? how
can I make it larger?
when I run local dd with bs=4K, I can see that the average IO size is
more than 300KB.
Read-ahead is easier in NFSv4, because the client probably has the file
delegated locally, and has far less need to constantly revalidate file
mapping(s).
Jeff
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