Re: [PATCH] tcp: efficient port randomisation (revised)
From: Stephen Hemminger <hidden>
Date: 2004-12-04 05:42:47
Possibly related (same subject, not in this thread)
- 2004-12-01 · Re: [PATCH] tcp: efficient port randomisation (revised) · "David S. Miller" <davem@davemloft.net>
- 2004-11-19 · Re: [PATCH] tcp: efficient port randomisation (revised) · Michael Vittrup Larsen <hidden>
- 2004-11-17 · [PATCH] tcp: efficient port randomisation (revised) · Stephen Hemminger <hidden>
If I special case to handle loopback, and get rid of the portalloc
lock, it comes out much better. These numbers are on the 800Mhz
PIII SMP, on a fast box like the dual Opeteron's it makes no difference
(always 30us).
Before TCP connection latency mean 79.9 std 10.55
*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP
ctxsw UNIX UDP TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
stp2-001 Linux 2.6.10- 8.270 38.6 24.3 61.6 48.5 45.9 76.6 74.6
stp2-001 Linux 2.6.10- 8.170 43.5 24.5 58.0 54.8 45.6 63.4 74.7
stp2-001 Linux 2.6.10- 2.740 50.6 29.9 40.3 48.3 59.8 75.1 101.
stp2-001 Linux 2.6.10- 8.140 46.6 29.7 57.6 48.8 45.5 72.0 74.4
stp2-001 Linux 2.6.10- 2.690 47.1 26.3 40.8 48.9 45.5 75.4 74.8
After TCP connection latency mean 73.8 std 0.55
*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP
ctxsw UNIX UDP TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
stp2-001 Linux 2.6.10- 8.260 38.1 25.7 63.3 48.1 66.6 75.4 74.9
stp2-001 Linux 2.6.10- 8.090 46.2 26.0 63.4 55.5 45.9 63.6 73.5
stp2-001 Linux 2.6.10- 8.210 39.0 21.2 63.1 55.4 58.8 63.8 73.5
stp2-001 Linux 2.6.10- 2.850 46.5 26.0 64.8 54.6 45.5 74.0 73.6
stp2-001 Linux 2.6.10- 8.200 42.9 21.5 64.9 55.6 62.4 64.1 73.5