x86, UV: Disable BAU on network congestion

Browse source

The numalink network can become so congested that TLB shootdown
using the Broadcast Assist Unit becomes slower than using IPI's.

In that case, disable the use of the BAU for a period of time.
The period is tunable.  When the period expires the use of the
BAU is re-enabled. A count of these actions is added to the
statistics file.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Cc: gregkh@suse.de
LKML-Reference: <E1OJvNy-0004a4-0a@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

This commit is contained in:

Cliff Wickman 2010-06-02 16:22:02 -05:00 • committed by Ingo Molnar

parent e8e5e8a804

commit 50fb55acc5

2 changed files with 77 additions and 3 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

4

arch/x86/include/asm/uv/uv_bau.h

View file

76

arch/x86/kernel/tlb_uv.c

View file