On 19.07.2013 03:12, Scott Long wrote:
Author: scottl
Date: Fri Jul 19 00:12:41 2013
New Revision: 253460
URL: http://svnweb.freebsd.org/changeset/base/253460
Log:
Overhaul error, information, and debug logging.
Obtained from: Netflix
MFC after: 3 days
Modified:
head/sys/dev/mps/mps.c
head/sys/dev/mps/mps_mapping.c
head/sys/dev/mps/mps_pci.c
head/sys/dev/mps/mps_sas.c
head/sys/dev/mps/mps_sas_lsi.c
head/sys/dev/mps/mps_table.c
head/sys/dev/mps/mps_user.c
head/sys/dev/mps/mpsvar.h
This change created significant CPU overhead under high I/O rate (350K
IOPS) because several functions inside mpssas_log_command() are now
writing into the buffer that is just discarded after that. The following
simple patch seems fixes the situation for me:
Index: mps_sas.c
===================================================================
--- mps_sas.c (revision 254181)
+++ mps_sas.c (working copy)
@@ -304,7 +304,7 @@ mpssas_log_command(struct mps_command *cm, u_int l
char str[192];
char path_str[64];
- if (cm == NULL)
+ if (cm == NULL || (cm->cm_sc->mps_debug & level) == 0)
return;
sbuf_new(&sb, str, sizeof(str), 0);
--
Alexander Motin
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