Or Gerlitz wrote:
On Tue, Sep 2, 2008 at 11:04 PM, Andy Grover <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
We've been discussing dropping RDS's support for using TCP as a
transport, and just focusing on RDS as a IB and iWARP-focused
protocol.
do we have any results that compare Oracle IPC using rds/bcopy/tcp vs udp?
Nothing current - would be great to see rds-stress data for RDS/TCP over
10GE compared to RDS/IB over 10GIB and RDS/IWARP over 10G.
The purpose of the TCP transport was to support simple ethernet NICs
with bcopy.
Our thinking at the time was that TCP (even if the path lengths are
longer than UDP) would
be more efficient under heavy load - than running UDP from user mode.
This would simplify the RDS codebase, allow easier inclusion of
more IB-centric features, and also give RDS an easier path towards
mainline Linux kernel inclusion. Also, the imminent RDS iWARP
support will address non-IB use cases.
So just to make sure, do IB and iWARP share the same transport code
today? if yes, does removing TCP means the transport abstraction would
not be needed any more, or you still want to maintain it for the
loopback case? Generally speaking, the loopback transport also uses
IB, correct? and if it doesn't I am quite sure it can.
I tend to agree with Jon that removing TCP might help with mainline
inclusion or might create damage...
Why does having the TCP module affect the issue of main line inclusion -
what is / are the issues ?
Roland, maybe you have more definitive intuitions re the netdev people
potential feedback on rds as a new socket type applicable to RDMA
cards such as IB and iWARP using a verbs/rdmacm native transport AND
to non RDMA cards with TCP transport, vs the case of RDS being "just"
a ULP under drivers/infiniband/ulps that defines a new socket type, etc.
Or
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