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Don't emit checksum histograms in ereport.fs.zfs.checksum events

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The checksum histograms were intended to be used with ATA and parallel
SCSI, which are obsolete.  With modern storage hardware, they will
almost always look like white noise; all bits will be wrong.  They only
serve to bloat the event.  That's a particular problem on FreeBSD, where
events must fit into a 1016 byte buffer.

This fixes issue #14717 for RAIDZ pools, but not for mirror pools.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rich Ercolani <rincebrain@gmail.com>
Signed-off-by: Alan Somers <asomers@gmail.com>
Sponsored-by: Axcient
Closes #15052
This commit is contained in:
Alan Somers 2023-07-11 14:45:06 -06:00 committed by Brian Behlendorf
parent ab0b0393cb
commit cf2a225b24
3 changed files with 5 additions and 41 deletions
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2
include/sys/fm/fs/zfs.h
View File

@ -112,8 +112,6 @@ extern "C" {
#define FM_EREPORT_PAYLOAD_ZFS_BAD_RANGE_CLEARS "bad_range_clears"
#define FM_EREPORT_PAYLOAD_ZFS_BAD_SET_BITS "bad_set_bits"
#define FM_EREPORT_PAYLOAD_ZFS_BAD_CLEARED_BITS "bad_cleared_bits"
#define FM_EREPORT_PAYLOAD_ZFS_BAD_SET_HISTOGRAM "bad_set_histogram"
#define FM_EREPORT_PAYLOAD_ZFS_BAD_CLEARED_HISTOGRAM "bad_cleared_histogram"
#define FM_EREPORT_PAYLOAD_ZFS_SNAPSHOT_NAME "snapshot_name"
#define FM_EREPORT_PAYLOAD_ZFS_DEVICE_NAME "device_name"
#define FM_EREPORT_PAYLOAD_ZFS_RAW_DEVICE_NAME "raw_name"

19
man/man8/zpool-events.8
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@ -26,7 +26,7 @@
.\" Copyright 2017 Nexenta Systems, Inc.
.\" Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
.\"
.Dd May 27, 2021
.Dd July 11, 2023
.Dt ZPOOL-EVENTS 8
.Os
.
@ -362,23 +362,6 @@ Like
but contains
.Pq Ar good data No & ~( Ns Ar bad data ) ;
that is, the bits set in the good data which are cleared in the bad data.
.It Sy bad_set_histogram
If this field exists, it is an array of counters.
Each entry counts bits set in a particular bit of a big-endian uint64 type.
The first entry counts bits
set in the high-order bit of the first byte, the 9th byte, etc, and the last
entry counts bits set of the low-order bit of the 8th byte, the 16th byte, etc.
This information is useful for observing a stuck bit in a parallel data path,
such as IDE or parallel SCSI.
.It Sy bad_cleared_histogram
If this field exists, it is an array of counters.
Each entry counts bit clears in a particular bit of a big-endian uint64 type.
The first entry counts bits
clears of the high-order bit of the first byte, the 9th byte, etc, and the
last entry counts clears of the low-order bit of the 8th byte, the 16th byte,
etc.
This information is useful for observing a stuck bit in a parallel data
path, such as IDE or parallel SCSI.
.El
.
.Sh I/O STAGES

25
module/zfs/zfs_fm.c
View File

@ -754,10 +754,6 @@ zfs_ereport_start(nvlist_t **ereport_out, nvlist_t **detector_out,
#define MAX_RANGES 16
typedef struct zfs_ecksum_info {
/* histograms of set and cleared bits by bit number in a 64-bit word */
uint8_t zei_histogram_set[sizeof (uint64_t) * NBBY];
uint8_t zei_histogram_cleared[sizeof (uint64_t) * NBBY];
/* inline arrays of bits set and cleared. */
uint64_t zei_bits_set[ZFM_MAX_INLINE];
uint64_t zei_bits_cleared[ZFM_MAX_INLINE];
@ -781,7 +777,7 @@ typedef struct zfs_ecksum_info {
} zfs_ecksum_info_t;
static void
update_histogram(uint64_t value_arg, uint8_t *hist, uint32_t *count)
update_bad_bits(uint64_t value_arg, uint32_t *count)
{
size_t i;
size_t bits = 0;
@ -789,10 +785,8 @@ update_histogram(uint64_t value_arg, uint8_t *hist, uint32_t *count)
/* We store the bits in big-endian (largest-first) order */
for (i = 0; i < 64; i++) {
if (value & (1ull << i)) {
hist[63 - i] = MAX(hist[63 - i], hist[63 - i] + 1);
if (value & (1ull << i))
++bits;
}
}
/* update the count of bits changed */
*count += bits;
@ -1010,10 +1004,8 @@ annotate_ecksum(nvlist_t *ereport, zio_bad_cksum_t *info,
offset++;
}
update_histogram(set, eip->zei_histogram_set,
&eip->zei_range_sets[range]);
update_histogram(cleared, eip->zei_histogram_cleared,
&eip->zei_range_clears[range]);
update_bad_bits(set, &eip->zei_range_sets[range]);
update_bad_bits(cleared, &eip->zei_range_clears[range]);
}
/* convert to byte offsets */
@ -1049,15 +1041,6 @@ annotate_ecksum(nvlist_t *ereport, zio_bad_cksum_t *info,
DATA_TYPE_UINT8_ARRAY,
inline_size, (uint8_t *)eip->zei_bits_cleared,
NULL);
} else {
fm_payload_set(ereport,
FM_EREPORT_PAYLOAD_ZFS_BAD_SET_HISTOGRAM,
DATA_TYPE_UINT8_ARRAY,
NBBY * sizeof (uint64_t), eip->zei_histogram_set,
FM_EREPORT_PAYLOAD_ZFS_BAD_CLEARED_HISTOGRAM,
DATA_TYPE_UINT8_ARRAY,
NBBY * sizeof (uint64_t), eip->zei_histogram_cleared,
NULL);
}
return (eip);
}