At 12:49 PM 11/14/2005, Nitin Hande wrote:
Michael Krause wrote:
At 01:01 PM 11/11/2005, Nitin
Hande wrote:
Michael Krause wrote:
At 10:28 AM 11/9/2005, Rick
Frank wrote:
Yes, the application is
responsible for detecting lost msgs at the application level - the
transport can not do this.
RDS
In absence of any protocol level
ack (and regardless of protocol level ack), it is the application which has
to implement its own reliability. RDS becomes a passive channel passing
packet back and forth including duplicate packets. The responsibility then
shifts to the
Michael Krause wrote:
At 01:01 PM 11/11/2005, Nitin Hande wrote:
Michael Krause wrote:
At 10:28 AM 11/9/2005, Rick Frank wrote:
Yes, the application is responsible for detecting lost msgs at the
application level - the transport can not do this.
RDS does not guarantee that a message has
At 10:28 AM 11/9/2005, Rick Frank wrote:
Yes, the application is responsible for detecting lost msgs at the
application level - the transport can not do this.
RDS does not guarantee that a message
has been delivered to the application - just that once the transport has
accepted a msg it will
Michael Krause wrote:
At 10:28 AM 11/9/2005, Rick Frank wrote:
Yes, the application is responsible for detecting lost msgs at the
application level - the transport can not do this.
RDS does not guarantee that a message has been delivered to the
application - just that once the transport has
On 11/11/05, Michael Krause [EMAIL PROTECTED] wrote:
Please clarify the following which was in the document provided by Oracle.
On page 3 of the RDS document, under the section RDP Interface, the 2nd
and 3rd paragraphs are state:
* RDP does not guarantee that a datagram is delivered to
At 02:09 PM 11/9/2005, Greg Lindahl wrote:
On Wed, Nov 09, 2005 at
01:57:06PM -0800, Michael Krause wrote:
What you indicate above is that RDS
will implement a resync of the two sides of the association to
determine
what has been successfully sent.
More accurate to say that it could
Mike Krause wrote in response to Greg Lindahl:
If it is to be reasonably robust, then RDS should be required to
support
the resync between the two sides of the communication. This aligns
with the
stated objective of implementing reliability in one location in
Yes, this is the case.
- Original Message -
From: Caitlin Bestler [EMAIL PROTECTED]
To: openib-general@openib.org
Sent: Thursday, November 10, 2005 1:48 PM
Subject: RE: [openib-general] [ANNOUNCE] Contribute RDS
(ReliableDatagramSockets) to OpenIB
Mike Krause wrote in response
At 10:48 AM 11/10/2005, Caitlin Bestler wrote:
Mike Krause wrote in response to Greg Lindahl:
If it is to
be reasonably robust, then RDS should be required to
support
the resync between the two sides of the communication. This
aligns
with the
stated objective of implementing reliability in
My concern is the requirement that RDS resync the structures in the
face of failureand know whether to re-transmit or will deal with
duplicates. Having pre-posted bufferswill help enable the resync to
be accomplished but should not be equated to pre-post equalsone can deal
with
At 12:37 PM 11/8/2005, Hal Rosenstock wrote:
On Tue, 2005-11-08 at 15:33,
Ranjit Pandit wrote:
Using APM is not useful because it doesn't provide failover across
HCA's.
Can't APM be made to work across HCAs ?
No. It requires state that is only within the HCA and there are
other aspects that
At 12:33 PM 11/8/2005, Ranjit Pandit wrote:
Mike wrote:
- RDS does not solve a set of failure models. For
example, if a RNIC / HCA
were to fail, then one cannot simply replay the operations on
another RNIC /
HCA without extracting state, etc. and providing some end-to-end
sync of
what was
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Michael
KrauseSent: Tuesday, November 08, 2005 1:08 PMTo: Ranjit
PanditCc: openib-general@openib.orgSubject: Re:
[openib-general] [ANNOUNCE] Contribute RDS ( ReliableDatagramSockets) to
OpenIB
At 12:33 PM
Caitlin,
Can you please use the standard quoting style? I can't tell which
comments are yours. Thanks.
-- greg
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--- Original Message -
From:
Michael Krause
To: Ranjit Pandit
Cc: openib-general@openib.org
Sent: Tuesday, November 08, 2005 4:08
PM
Subject: Re: [openib-general] [ANNOUNCE]
Contribute RDS(ReliableDatagramSockets) to OpenIB
At 12:33 PM 11/8/2005, Ranjit Pandit
On Tue, Nov 08, 2005 at 01:08:13PM -0800, Michael Krause wrote:
If an application takes any action assuming that send complete means
it is delivered, then it is subject to silent data corruption.
Right. That's the same as pretty much all other *transport* layers. I
don't think anyone's
At 11:42 AM 11/9/2005, Greg Lindahl wrote:
On Tue, Nov 08, 2005 at
01:08:13PM -0800, Michael Krause wrote:
If an application takes any action assuming that send complete
means
it is delivered, then it is subject to silent data
corruption.
Right. That's the same as pretty much all other
-
From: Michael Krause
To: Ranjit Pandit
Cc:
openib-general@openib.org
Sent: Tuesday, November 08, 2005 4:08 PM
Subject: Re: [openib-general] [ANNOUNCE] Contribute
RDS(ReliableDatagramSockets) to OpenIB
At 12:33 PM 11/8/2005, Ranjit Pandit wrote:
Mike wrote:
- RDS does not solve
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Michael
KrauseSent: Wednesday, November 09, 2005 12:21 PMTo:
Rick Frank; Ranjit PanditCc:
openib-general@openib.orgSubject: Re: [openib-general] [ANNOUNCE]
Contribute RDS(ReliableDatagramSockets) to OpenIB
On Wed, Nov 09, 2005 at 12:18:28PM -0800, Michael Krause wrote:
So, things like HCA failure are not transparent and one cannot simply
replay the operations since you don't know what was really seen by the
other side unless the application performs the resync itself.
I think you are
At 01:24 PM 11/9/2005, Greg Lindahl wrote:
On Wed, Nov 09, 2005 at
12:18:28PM -0800, Michael Krause wrote:
So, things like HCA failure are not transparent and one cannot
simply
replay the operations since you don't know what was really seen by
the
other side unless the application performs
On Wed, Nov 09, 2005 at 01:57:06PM -0800, Michael Krause wrote:
What you indicate above is that RDS
will implement a resync of the two sides of the association to determine
what has been successfully sent.
More accurate to say that it could implement that. I'm just
kibbutzing on someone
On 11/9/05, Michael Krause [EMAIL PROTECTED] wrote:
I hadn't assumed anything. I'm simply trying to understand the assertions
concerning availability and recovery. What you indicate above is that RDS
will implement a resync of the two sides of the association to determine
what has been
On 11/9/05, Greg Lindahl [EMAIL PROTECTED] wrote:
On Wed, Nov 09, 2005 at 01:57:06PM -0800, Michael Krause wrote:
What you indicate above is that RDS
will implement a resync of the two sides of the association to determine
what has been successfully sent.
More accurate to say that it
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Michael Krause
Sent: Wednesday, November 09, 2005 12:21 PM
To: Rick Frank; Ranjit Pandit
Cc: openib-general@openib.org
Subject: Re: [openib-general] [ANNOUNCE] Contribute
RDS(ReliableDatagramSockets
Rick wrote,
I've atttached a draft proposal for RDS from Oracle which discusses some of
the motivation for RDS.
I assume that you have a driver that uses TCP sockets, Correct ?
If so, have you compared the performance of RDS to SDP ?
woody
___
04, 2005 11:35 AM
Subject: RE: [openib-general] [ANNOUNCE] Contribute RDS
(ReliableDatagramSockets) to OpenIB
Rick wrote,
I've atttached a draft proposal for RDS from Oracle which discusses some
of
the motivation for RDS.
I assume that you have a driver that uses TCP sockets, Correct
Rick Frank wrote:
No we do not use TCP sockets - we use to many connections for this 100k+.
Isn't RDS implemented on top of reliable IB/RDMA connections anyway?
- Sean
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openib-general mailing list
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Rick wrote,
I've atttached a draft proposal for RDS from Oracle which discusses some of
the motivation for RDS.
Couple of questions/comments on the spec.
AF_INET_OFFLOAD should be renamed to something like AF_INET_RDS.
Would something like SCTP provide the same type of capabilities
(relaible
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bob Woodruff
Sent: Friday, November 04, 2005 2:15 PM
To: 'Rick Frank'; Ranjit Pandit; Grant Grundler
Cc: openib-general@openib.org
Subject: RE: [openib-general] [ANNOUNCE] Contribute RDS
,
woody
-Original Message-
From: Caitlin Bestler [mailto:[EMAIL PROTECTED]
Sent: Friday, November 04, 2005 2:31 PM
To: Woodruff, Robert J; Rick Frank; Ranjit Pandit; Grant Grundler
Cc: openib-general@openib.org
Subject: RE: [openib-general] [ANNOUNCE] Contribute RDS
Bob wrote,
Perhaps if tunneling udp packets over RC connections rather than
UD connections provides better performance, as was seen in the RDS
experiment, then why not just convert
IPoIB to use a connected model (rather than datagrams)
and then all existing IP upper level
protocols would
, November 04, 2005 2:31 PM
To: Woodruff, Robert J; Rick Frank; Ranjit Pandit; Grant Grundler
Cc: openib-general@openib.org
Subject: RE: [openib-general] [ANNOUNCE] Contribute RDS (
ReliableDatagramSockets) to OpenIB
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED
Rick wrote,
SCTP is connection based - we have many dependencies on our connectionless
datagram model.
I think I get it now. I was just talking with Roy about SCTP,
and he said the same thing, SCTP is a connected rather than datagram model,
so SCTP does not seem to solve the problem since it
Ranjit wrote,
RDS is somewhat like SDP in that it offloads/accelerates SOCK_DGRAM
instead of SOCK_STREAM.
So back to the question from Roland that started this thread.
When do you plan to re-work the code to use the OpenIB
verbs and make it suitable for the kernel ?
And do you plan to develop
-
From: Bob Woodruff [EMAIL PROTECTED]
To: 'Ranjit Pandit' [EMAIL PROTECTED]
Cc: Rick Frank [EMAIL PROTECTED]; openib-general@openib.org
Sent: Friday, November 04, 2005 6:58 PM
Subject: RE: [openib-general] [ANNOUNCE] Contribute
RDS(ReliableDatagramSockets) to OpenIB
Ranjit wrote,
RDS
Rick We (Oracle) are currently investigating / working on an RDS
Rick over Ethernet driver for Linux. Our current plans are to
Rick produce a new verbs provider that registers with Gen 2 IB
Rick verbs layer. This new driver will bind to a standard
Rick ethernet nic driver and
Grant wrote,
2) include some docs on it's use and why RDS is better than SDP.
3) nag people to review the ported code
4) post functional test results
Looking at the code that is in the contrib branch,
it looks like RDS uses connected channels,
Is that correct ?
If so, I do not see that it
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