Thanks, I'll look into it. Scott
On Aug 11, 2013, at 6:01 AM, Alexander Motin <m...@freebsd.org> wrote: > 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 _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
