From: Vallish Vaidyeshwara <vallish@amazon•com>
To: <davem@davemloft•net>, <shuah@kernel•org>,
<netdev@vger•kernel.org>, <linux-kernel@vger•kernel.org>
Cc: <eduval@amazon•com>, <anchalag@amazon•com>, <vallish@amazon•com>
Subject: [PATCH RESEND 0/2] enable hires timer to timeout datagram socket
Date: Fri, 18 Aug 2017 18:44:08 +0000 [thread overview]
Message-ID: <1503081850-10671-1-git-send-email-vallish@amazon.com> (raw)
Hello Dave,
Resending the patch series to include netdev mailing list with a
cover letter.
I am submitting 2 patch series to enable hires timer to timeout
datagram sockets (AF_UNIX & AF_INET domain) and test code to test
timeout accuracy on these sockets.
There has been a behavior change in 4.9 kernel with refactoring of Kernel
timer wheel in 4.8. We have a use case wherein our datagram socket
application is sensitive to socket timeout including long timeouts.
One of the test runs with a timeout value of 180 seconds timed out at
190 seconds.
[root@]# ./datagram_sock_timeout 180000
datagram_sock_timeout failed: took 190.00 seconds
[root@]#
The same program when run on a 4.4 kernel would timeout more accurately and
the kernel added slack was not noticeable to user application.
Patch 1: Has core code change of enabling hires timer to timeout datagram
socket on AF_UNIX and AF_INET domain
Patch 2: Test code to report regression in timeout behavior related to
patch 1
Vallish Vaidyeshwara (2):
net: enable high resolution timer mode to timeout datagram sockets
selftests/net: add test to verify datagram socket timeout
net/core/datagram.c | 11 +-
tools/testing/selftests/net/Makefile | 3 +-
.../testing/selftests/net/datagram_sock_timeout.c | 119 +++++++++++++++++++++
.../selftests/net/run_datagram_sock_timeout.sh | 12 +++
4 files changed, 143 insertions(+), 2 deletions(-)
create mode 100644 tools/testing/selftests/net/datagram_sock_timeout.c
create mode 100755 tools/testing/selftests/net/run_datagram_sock_timeout.sh
--
2.7.3.AMZN
next reply other threads:[~2017-08-18 18:44 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-18 18:44 Vallish Vaidyeshwara [this message]
2017-08-18 18:44 ` [PATCH RESEND 1/2] net: enable high resolution timer mode to timeout datagram sockets Vallish Vaidyeshwara
2017-08-21 20:10 ` Cong Wang
2017-08-22 11:14 ` Vallish Vaidyeshwara
2017-08-18 18:44 ` [PATCH RESEND 2/2] selftests/net: add test to verify datagram socket timeout Vallish Vaidyeshwara
2017-08-18 20:18 ` [PATCH RESEND 0/2] enable hires timer to timeout datagram socket Richard Cochran
2017-08-18 22:27 ` Vallish Vaidyeshwara
2017-08-19 6:21 ` Richard Cochran
2017-08-20 1:47 ` Vallish Vaidyeshwara
2017-08-21 18:22 ` Vallish Vaidyeshwara
2017-08-22 6:23 ` Richard Cochran
2017-08-22 11:17 ` Vallish Vaidyeshwara
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