Messages in this thread | | | From | Vallish Vaidyeshwara <> | Subject | [PATCH RESEND 0/2] enable hires timer to timeout datagram socket | Date | Fri, 18 Aug 2017 18:44:08 +0000 |
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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
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