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A single slow responding disk can affect the overall read performance of a raidz group. When a raidz child disk is determined to be a persistent slow outlier, then have it sit out during reads for a period of time. The raidz group can use parity to reconstruct the data that was skipped. Each time a slow disk is placed into a sit out period, its `vdev_stat.vs_slow_ios count` is incremented and a zevent class `ereport.fs.zfs.delay` is posted. The length of the sit out period can be changed using the `raid_read_sit_out_secs` module parameter. Setting it to zero disables slow outlier detection. Sponsored-by: Klara, Inc. Sponsored-by: Wasabi Technology, Inc. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com> Contributions-by: Don Brady <don.brady@klarasystems.com> Contributions-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #17227
107 lines
3.2 KiB
C
107 lines
3.2 KiB
C
// SPDX-License-Identifier: BSD-2-Clause
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/*
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* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _OPENSOLARIS_SYS_TIME_H_
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#define _OPENSOLARIS_SYS_TIME_H_
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#pragma once
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#include_next <sys/time.h>
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#include <sys/debug.h>
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#ifndef _SYS_KERNEL_H_
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extern int hz;
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#endif
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#define SEC 1
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#define MILLISEC 1000UL
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#define MICROSEC 1000000UL
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#define NANOSEC 1000000000UL
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#define TIME_MAX LLONG_MAX
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#define MSEC2NSEC(m) ((hrtime_t)(m) * (NANOSEC / MILLISEC))
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#define NSEC2MSEC(n) ((n) / (NANOSEC / MILLISEC))
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#define USEC2NSEC(m) ((hrtime_t)(m) * (NANOSEC / MICROSEC))
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#define NSEC2USEC(n) ((n) / (NANOSEC / MICROSEC))
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#define NSEC2SEC(n) ((n) / (NANOSEC / SEC))
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#define SEC2NSEC(m) ((hrtime_t)(m) * (NANOSEC / SEC))
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typedef longlong_t hrtime_t;
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#if defined(__i386__) || defined(__powerpc__)
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#define TIMESPEC_OVERFLOW(ts) \
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((ts)->tv_sec < INT32_MIN || (ts)->tv_sec > INT32_MAX)
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#else
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#define TIMESPEC_OVERFLOW(ts) \
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((ts)->tv_sec < INT64_MIN || (ts)->tv_sec > INT64_MAX)
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#endif
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#define SEC_TO_TICK(sec) ((sec) * hz)
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#define NSEC_TO_TICK(nsec) ((nsec) / (NANOSEC / hz))
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static __inline hrtime_t
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getlrtime(void)
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{
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struct timespec ts;
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hrtime_t nsec;
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getnanouptime(&ts);
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nsec = ((hrtime_t)ts.tv_sec * NANOSEC) + ts.tv_nsec;
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return (nsec);
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}
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static __inline hrtime_t
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gethrtime(void)
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{
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struct timespec ts;
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hrtime_t nsec;
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nanouptime(&ts);
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nsec = ((hrtime_t)ts.tv_sec * NANOSEC) + ts.tv_nsec;
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return (nsec);
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}
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#define gethrestime_sec() (time_second)
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#define gethrestime(ts) getnanotime(ts)
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#define gethrtime_waitfree() gethrtime()
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extern int nsec_per_tick; /* nanoseconds per clock tick */
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#define ddi_get_lbolt64() \
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(int64_t)(((getsbinuptime() >> 16) * hz) >> 16)
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#define ddi_get_lbolt() (clock_t)ddi_get_lbolt64()
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#else
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static __inline hrtime_t
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gethrtime(void)
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{
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struct timespec ts;
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clock_gettime(CLOCK_UPTIME, &ts);
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return (((uint64_t)ts.tv_sec) * NANOSEC + ts.tv_nsec);
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}
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#endif /* !_OPENSOLARIS_SYS_TIME_H_ */
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