Hi guys,
My colleague Yihang Li noticed this issue when testing throughput for
hisi SAS arm64 controller on v5.18-rc6:
estuary:/$ bash ./create_fio_task.sh 4k read 128 1
test2 4k
my_runtime 1500
Creat 4k_read_depth128_fiotest file successfully
job1: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=128
job1: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=128
job1: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=128
job1: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=128
job1: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=128
job1: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=128
job1: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=128
job1: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=128
job1: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=128
job1: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=128
fio-2.2.10
Starting 10 processes
N[ 304.798377] arm-smmu-v3 arm-smmu-v3.3.auto: event 0x10
received:iops] [eta 23m:39s]
O[ 304.804431] arm-smmu-v3 arm-smmu-v3.3.auto: 0x0000741000000010
T[ 304.810404] arm-smmu-v3 arm-smmu-v3.3.auto: 0x000012000000007a
I[ 304.816379] arm-smmu-v3 arm-smmu-v3.3.auto: 0x00000000abff6000
C[ 304.822354] arm-smmu-v3 arm-smmu-v3.3.auto: 0x00000000abff6000
E[ 304.828330] arm-smmu-v3 arm-smmu-v3.3.auto: event 0x10 received:
:[ 304.834392] arm-smmu-v3 arm-smmu-v3.3.auto: 0x0000741000000010
[ 304.840368] arm-smmu-v3 arm-smmu-v3.3.auto: 0x0000120000000058
[ 304.846344] arm-smmu-v3 arm-smmu-v3.3.auto: 0x00000000abff6100
R[ 304.852320] arm-smmu-v3 arm-smmu-v3.3.auto: 0x00000000abff6000
a[ 304.858297] arm-smmu-v3 arm-smmu-v3.3.auto: event 0x10 received:
s[ 304.864361] arm-smmu-v3 arm-smmu-v3.3.auto: 0x0000741000000010
I[ 304.870337] arm-smmu-v3 arm-smmu-v3.3.auto: 0x000012000000004a
n[ 304.876313] arm-smmu-v3 arm-smmu-v3.3.auto: 0x00000000abff62c0
t[ 304.882289] arm-smmu-v3 arm-smmu-v3.3.auto: 0x00000000abff6000
Event 0x10 is a translation fault, meaning the DMA mapping is prob
misconfigured.
I don't think it's an IOMMU issue as I tested that separately with a DMA
mapping benchmark driver.
I'm told v5.17-rc7 does not have the issue. Any idea on the possible
cause or if there is a fix in waiting? It could be an issue with the
SCSI hba driver.
I'll bisect in the meantime.
thanks,
John
