On 18-May-18 3:23 PM, Reshma Pattan wrote:
Added known issue of rte_abort taking a long time
on FreeBSD due to recent memory subsystem rework.
Signed-off-by: Reshma Pattan <reshma.pat...@intel.com>
---
doc/guides/rel_notes/release_18_05.rst | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/doc/guides/rel_notes/release_18_05.rst
b/doc/guides/rel_notes/release_18_05.rst
index 3dcb62538..c01781956 100644
--- a/doc/guides/rel_notes/release_18_05.rst
+++ b/doc/guides/rel_notes/release_18_05.rst
@@ -485,6 +485,21 @@ Known Issues
dpdk-pdump example and any other applications using librte_pdump, cannot
work
with older version DPDK primary applications.
+* **rte_abort takes a long time on FreeBSD due to memory subsytsem rework.**
+
+ With the recent memory subsystem changes, DPDK processes now allocate a large
+ area of virtual memory address space. During rte_abort FreeBSD will dump the
+ contents of the whole reserved memory range, not just the used portion, to a
+ core dump file. Write this large core file can take a significant amount of
+ time, causing processes to appear hung on the system.
+
+ The work around for the issue is to set the system resource limits for core
+ dumps before running any tests e.g."limit coredumpsize 0". This will
+ effectively disable core dumps on FreeBSD. If they are not to be completely
+ disabled, a suitable limit, e.g. 1G might be specified instead of 0. This
+ needs to be run per-shell session, or before every test run. This change
+ can also be made persistent by adding "kern.coredump=0" to /etc/sysctl.conf
+
Shared Library Versions
-----------------------
The explanation is slightly wrong.
The slowdown was there before memory rework - FreeBSD apparently dumps
entire memory contents, including contigmem pages and anonymous pages.
It's just that previously, we didn't preallocate so much memory, so it
took ~5 seconds instead of minutes because it wasn't trying to dump 128
gigabytes of VA space.
Otherwise,
Acked-by: Anatoly Burakov <anatoly.bura...@intel.com>
--
Thanks,
Anatoly
