22054f8891
Report, on a periodic basis, the I/O latencies the CAM I/O scheduler computes. These times are only for the hardware portion of the I/O as measured from the time the operation is scheduled with the SIM using xpt_action() until the SIM reports it has completed with xpt_dine(). Any time the I/O operation spends in a software queue is no included. The P50 (median), P90, P99 and P99.9 statistics about the latency of each of the read, write and trim operations that completed during the polling interval are reported. If there are fewer than 2, 10, 100 or 1000 operations during the polling interval, no statistic is reported and a single dash '-' is displayed. The read, write and trim commands (either on the command line or at run time) toggle display of these operations. The color command toggles color (it defaults to on, like gstat). When color is enabled, unknown statistics are reported in blue, high latency for a statistics is reported in red, medium in magenta and low in green (as with gstat). The med= and hi= commands can set these latency thresholds. Limitations: The entire sysctl space for all the devices is walked for each polling period. This should be optimized to remember the OIDs and only do such polling with the xpt generation changes. There is also no way to filter devices displayed. This command only works on physical devies that are connected to SCSI, ATA or NVME sims as those are the only ones that are instrumented in the CAM I/O scheduler (the CAM_IOSCHED_DYNAMIC option must be in the kernel, and the dynamic scheduler can't be disabled). MFC After: 1 month Relnotes: yes Sponsored by: Netflix Reviewed by: pauamma_gundo.com, chs Differential Revision: https://reviews.freebsd.org/D34259
22 lines
490 B
Makefile
22 lines
490 B
Makefile
# @(#)Makefile 8.1 (Berkeley) 6/6/93
|
|
# $FreeBSD$
|
|
|
|
.include <src.opts.mk>
|
|
|
|
PROG= systat
|
|
SRCS= cmds.c cmdtab.c devs.c fetch.c iolat.c iostat.c keyboard.c main.c sysput.c \
|
|
netcmds.c netstat.c pigs.c proc.c swap.c icmp.c \
|
|
mode.c ip.c sctp.c tcp.c zarc.c \
|
|
vmstat.c convtbl.c ifcmds.c ifstat.c
|
|
|
|
.if ${MK_INET6_SUPPORT} != "no"
|
|
SRCS+= icmp6.c ip6.c
|
|
CFLAGS+= -DINET6
|
|
.endif
|
|
|
|
LIBADD= tinfow ncursesw m devstat kvm util procstat
|
|
|
|
.include <bsd.prog.mk>
|
|
|
|
CFLAGS+= -Wno-cast-align -Wno-cast-qual
|