On 15-Jun-10 10:09 AM, Eli Dorfman (Voltaire) wrote:
Yevgeny Kliteynik wrote:
Eli,
On 13-Jun-10 6:10 PM, Eli Dorfman (Voltaire) wrote:
After a second thought and in order not to break current configuration,
I send this modified patch that does not change connect_roots option but
changes its functionality in up-down (I think that in fat-tree it is
already implemented)
Modify connect_roots option to allow connectivity between
all switches in up-down routing algorithm and in this way be
fully IBA compliant
Signed-off-by: Eli Dorfman<[email protected]>
---
opensm/man/opensm.8.in | 2 +-
opensm/opensm/main.c | 2 +-
opensm/opensm/osm_ucast_updn.c | 4 +---
3 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/opensm/man/opensm.8.in b/opensm/man/opensm.8.in
index 9053611..c67126e 100644
--- a/opensm/man/opensm.8.in
+++ b/opensm/man/opensm.8.in
@@ -174,7 +174,7 @@ the host comes back online.
.TP
\fB\-z\fR, \fB\-\-connect_roots\fR
This option enforces routing engines (up/down and
-fat-tree) to make connectivity between root switches and in
+fat-tree) to make connectivity between all switches and in
this way to be fully IBA complaint. In many cases this can
violate "pure" deadlock free algorithm, so use it carefully.
.TP
diff --git a/opensm/opensm/main.c b/opensm/opensm/main.c
index 0093aa7..82ca78f 100644
--- a/opensm/opensm/main.c
+++ b/opensm/opensm/main.c
@@ -187,7 +187,7 @@ static void show_usage(void)
" Sets the SL to use to communicate with the
SM/SA. Defaults to 0.\n\n");
printf("--connect_roots, -z\n"
" This option enforces routing engines (up/down
and \n"
- " fat-tree) to make connectivity between root
switches\n"
+ " fat-tree) to make connectivity between all
switches\n"
" and in this way be IBA compliant. In many
cases,\n"
" this can violate \"pure\" deadlock free
algorithm, so\n"
" use it carefully.\n\n");
diff --git a/opensm/opensm/osm_ucast_updn.c
b/opensm/opensm/osm_ucast_updn.c
index 164c6f4..f44ca24 100644
--- a/opensm/opensm/osm_ucast_updn.c
+++ b/opensm/opensm/osm_ucast_updn.c
@@ -314,9 +314,7 @@ static int updn_set_min_hop_table(IN updn_t * p_updn)
item = cl_qmap_next(item)) {
p_sw = (osm_switch_t *)item;
/* Clear Min Hop Table */
- if (p_subn->opt.connect_roots)
- updn_clear_non_root_hops(p_updn, p_sw);
- else
+ if (!p_subn->opt.connect_roots)
osm_switch_clear_hops(p_sw);
}
What kind of testing was done for this?
I have a strong feeling that it will break up/down.
If the connect_roots option is on, you will not clear
the lid matrix at all, and it will contain also the
down/up routes.
that is the idea.
instead of leaving only up/dpwn routes we want to keep routes between all
switches.
the routes between host nodes will still be up/down.
Lid matrix might contain down/up routes between many
kinds of switches, not only between roots. This means
that you might have down/up paths between leaf switches,
even though you could have found up/down path for them.
This also means that you might end up with down/up routes
between HCAs that are connected to these leafs.
-- Yevgeny
Eli
-- Yevgeny
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