Re: [PATCH net-next 0/9] rxrpc: Preparation for slow-start algorithm [ver #2]

[David Miller]

From: David Howells 
Date: Thu, 22 Sep 2016 09:22:00 +0100

> Tagged thusly:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
>   rxrpc-rewrite-20160922-v2

Pulled, thanks David.

Re: [PATCH net-next 0/9] rxrpc: Preparation for slow-start algorithm [ver #2]

[David Miller]

From: David Howells 
Date: Thu, 22 Sep 2016 09:22:00 +0100

> Tagged thusly:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
>   rxrpc-rewrite-20160922-v2

Pulled, thanks David.

[PATCH net-next 0/9] rxrpc: Preparation for slow-start algorithm [ver #2]

[David Howells]

Here are some patches that prepare for improvements in ACK generation and
for the implementation of the slow-start part of the protocol:

 (1) Stop storing the protocol header in the Tx socket buffers, but rather
 generate it on the fly.  This potentially saves a little space and
 makes it easier to alter the header just before transmission (the
 flags may get altered and the serial number has to be changed).

 (2) Mask off the Tx buffer annotations and add a flag to record which ones
 have already been resent.

 (3) Track RTT on a per-peer basis for use in future changes.  Tracepoints
 are added to log this.

 (4) Send PING ACKs in response to incoming calls to elicit a PING-RESPONSE
 ACK from which RTT data can be calculated.  The response also carries
 other useful information.

 (5) Expedite PING-RESPONSE ACK generation from sendmsg.  If we're actively
 using sendmsg, this allows us, under some circumstances, to avoid
 having to rely on the background work item to run to generate this
 ACK.

 This requires ktime_sub_ms() to be added.

 (6) Set the REQUEST-ACK flag on some DATA packets to elicit ACK-REQUESTED
 ACKs from which RTT data can be calculated.

 (7) Limit the use of pings and ACK requests for RTT determination.

Changes:

 (V2) Don't use the C division operator for 64-bit division.  One instance
  should use do_div() and the other should be using nsecs_to_jiffies().

  The last two patches got transposed, leading to an undefined symbol
  in one of them.

  Reported-by: kbuild test robot 

The patches can be found here also:


http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=rxrpc-rewrite

Tagged thusly:

git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
rxrpc-rewrite-20160922-v2

David
---
David Howells (9):
  rxrpc: Don't store the rxrpc header in the Tx queue sk_buffs
  rxrpc: Add re-sent Tx annotation
  rxrpc: Add per-peer RTT tracker
  rxrpc: Send pings to get RTT data
  rxrpc: Expedite ping response transmission
  rxrpc: Add ktime_sub_ms()
  rxrpc: Obtain RTT data by requesting ACKs on DATA packets
  rxrpc: Reduce the number of ACK-Requests sent
  rxrpc: Reduce the number of PING ACKs sent


 include/linux/ktime.h|5 ++
 include/trace/events/rxrpc.h |   61 ++
 net/rxrpc/ar-internal.h  |   47 -
 net/rxrpc/call_event.c   |   56 ++--
 net/rxrpc/conn_object.c  |1 
 net/rxrpc/input.c|  100 ++--
 net/rxrpc/misc.c |   25 ++---
 net/rxrpc/output.c   |  117 --
 net/rxrpc/peer_event.c   |   41 +++
 net/rxrpc/peer_object.c  |1 
 net/rxrpc/rxkad.c|8 +--
 net/rxrpc/sendmsg.c  |   56 
 net/rxrpc/sysctl.c   |2 -
 13 files changed, 390 insertions(+), 130 deletions(-)

[PATCH net-next 0/9] rxrpc: Preparation for slow-start algorithm [ver #2]

[David Howells]

Here are some patches that prepare for improvements in ACK generation and
for the implementation of the slow-start part of the protocol:

 (1) Stop storing the protocol header in the Tx socket buffers, but rather
 generate it on the fly.  This potentially saves a little space and
 makes it easier to alter the header just before transmission (the
 flags may get altered and the serial number has to be changed).

 (2) Mask off the Tx buffer annotations and add a flag to record which ones
 have already been resent.

 (3) Track RTT on a per-peer basis for use in future changes.  Tracepoints
 are added to log this.

 (4) Send PING ACKs in response to incoming calls to elicit a PING-RESPONSE
 ACK from which RTT data can be calculated.  The response also carries
 other useful information.

 (5) Expedite PING-RESPONSE ACK generation from sendmsg.  If we're actively
 using sendmsg, this allows us, under some circumstances, to avoid
 having to rely on the background work item to run to generate this
 ACK.

 This requires ktime_sub_ms() to be added.

 (6) Set the REQUEST-ACK flag on some DATA packets to elicit ACK-REQUESTED
 ACKs from which RTT data can be calculated.

 (7) Limit the use of pings and ACK requests for RTT determination.

Changes:

 (V2) Don't use the C division operator for 64-bit division.  One instance
  should use do_div() and the other should be using nsecs_to_jiffies().

  The last two patches got transposed, leading to an undefined symbol
  in one of them.

  Reported-by: kbuild test robot 

The patches can be found here also:


http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=rxrpc-rewrite

Tagged thusly:

git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
rxrpc-rewrite-20160922-v2

David
---
David Howells (9):
  rxrpc: Don't store the rxrpc header in the Tx queue sk_buffs
  rxrpc: Add re-sent Tx annotation
  rxrpc: Add per-peer RTT tracker
  rxrpc: Send pings to get RTT data
  rxrpc: Expedite ping response transmission
  rxrpc: Add ktime_sub_ms()
  rxrpc: Obtain RTT data by requesting ACKs on DATA packets
  rxrpc: Reduce the number of ACK-Requests sent
  rxrpc: Reduce the number of PING ACKs sent


 include/linux/ktime.h|5 ++
 include/trace/events/rxrpc.h |   61 ++
 net/rxrpc/ar-internal.h  |   47 -
 net/rxrpc/call_event.c   |   56 ++--
 net/rxrpc/conn_object.c  |1 
 net/rxrpc/input.c|  100 ++--
 net/rxrpc/misc.c |   25 ++---
 net/rxrpc/output.c   |  117 --
 net/rxrpc/peer_event.c   |   41 +++
 net/rxrpc/peer_object.c  |1 
 net/rxrpc/rxkad.c|8 +--
 net/rxrpc/sendmsg.c  |   56 
 net/rxrpc/sysctl.c   |2 -
 13 files changed, 390 insertions(+), 130 deletions(-)