Messages in this thread | | | Date | Sat, 23 Sep 2000 12:59:55 +1000 (EST) | From | Chris Pascoe <> | Subject | Sol 8 Sparc / Linux 2.2.17 TCP interoperability problems |
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Is anyone else experiencing an interoperability problem when running the nfs-utils 0.1.9.1 or 0.2 on an (unpatched) 2.2.16 or 2.2.17 kernel NFS Server, exporting to a Solaris 8 Sparc (patched with recommended patches as of 6/Sep/2000) client. (Am I the only one trying this config?) I had a brief look through the nfs and linux-kernel mailing archives and didn't come across anything mentioning this NFS combination (with the new nfs-utils, at least).
The problem that I appear to see is that the setsockopt(..., SO_RCVBUF, 1024..) which occurs in support/nfs/rpcmisc.c (during the mountd process) seems to cause a situation where no data can be received from the showmount's TCP connection; the Linux TCP stack refuses to acknowledge any data received from the Sun box. Removing the setsockopt() calls or increasing the rcvbuf size by nine bytes to 1033 resolves the problem.
A brief tcpdump showing the behaviour for the two cases, and some standalone test code which demonstrates the problem on my systems (without needing to break / setup mountd) is available at: http://celab21.pc.elec.uq.edu.au/~chris/tcpbug/
I lack the level of understanding of the Linux 2.2.x TCP stack needed to resolve the problem alone, but it seems the behaviour I am seeing may be related to some things discussed /changes made during the 'select()/socket has problems under 2.2.x' thread on linux-kernel around March last year.
Chris Pascoe
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