* [RFCv4 PATCH 0/2] net: Introduce recvmmsg socket syscall
@ 2009-09-16 17:07 Arnaldo Carvalho de Melo
0 siblings, 0 replies; only message in thread
From: Arnaldo Carvalho de Melo @ 2009-09-16 17:07 UTC (permalink / raw)
To: David Miller
Cc: Caitlin Bestler, Chris Van Hoof, Clark Williams, Neil Horman,
Nir Tzachar, Nivedita Singhvi, Paul Moore,
Rémi Denis-Courmont, Steven Whitehouse,
Linux Networking Development Mailing List
Hi,
Nir, can you please test with this patchset and check if latency
numbers improved? They should, I think :-)
New perf callgraphs here:
http://oops.ghostprotocols.net:81/acme/perf.recvmsg.step2.cg.data.txt.bz2
versus
http://oops.ghostprotocols.net:81/acme/perf.recvmmsg.step2.cg.data.txt.bz2
Look at what appears now on the radar, its not locking :-)
Or course, I need to do more tests, but it looks promising, please give
it a go and report back here if you can!
- Arnaldo
# Samples: 761074
#
# Overhead Command Shared Object Symbol
# ........ ........ ........................ ......
#
6.54% recvmmsg [kernel] [k] skb_set_owner_r
|
|--99.43%-- sock_queue_rcv_skb
| __udp_queue_rcv_skb
| sk_backlog_rcv
| release_sock
| __sys_recvmmsg
| sys_recvmmsg
| system_call_fastpath
| syscall
| |
| --12.76%-- main
| __libc_start_main
|
--0.57%-- __udp_queue_rcv_skb
sk_backlog_rcv
release_sock
__sys_recvmmsg
sys_recvmmsg
system_call_fastpath
syscall
|
--10.84%-- main
__libc_start_main
5.88% recvmmsg [kernel] [k] _spin_lock_irqsave
|
|--47.58%-- skb_queue_tail
| sock_queue_rcv_skb
| __udp_queue_rcv_skb
| sk_backlog_rcv
| release_sock
| __sys_recvmmsg
| sys_recvmmsg
| system_call_fastpath
| syscall
| |
| --12.56%-- main
| __libc_start_main
|
|--41.85%-- __skb_recv_datagram
| __udp_recvmsg
| udp_unlocked_recvmsg
| sock_common_unlocked_recvmsg
| __sock_unlocked_recvmsg_nosec
| |
| |--98.41%-- sock_unlocked_recvmsg_nosec
| | __sys_recvmsg
| | __sys_recvmmsg
| | sys_recvmmsg
| | system_call_fastpath
| | syscall
| | |
| | --12.82%-- main
| | __libc_start_main
| |
| --1.59%-- sock_unlocked_recvmsg
| __sys_recvmsg
| __sys_recvmmsg
| sys_recvmmsg
- Arnaldo
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