On 5/28/20 5:06 PM, Song Liu wrote:
On Thu, May 28, 2020 at 3:18 AM Michal Soltys <msoltyspl@xxxxxxxxx> wrote:
This is slow because we are processing 4kB at a time. But it is slower than
my expectation. What are the speeds measured at boot? Something like the
following in dmesg:
[ 3.851064] raid6: avx2x4 gen() 17328 MB/s
[ 3.877404] raid6: avx2x4 xor() 11033 MB/s
[ 3.903410] raid6: avx2x2 gen() 14710 MB/s
[ 3.929410] raid6: avx2x2 xor() 8921 MB/s
[ 3.955408] raid6: avx2x1 gen() 12687 MB/s
[ 3.981405] raid6: avx2x1 xor() 8414 MB/s
[ 4.007409] raid6: sse2x4 gen() 9105 MB/s
[ 4.033403] raid6: sse2x4 xor() 5724 MB/s
[ 4.059408] raid6: sse2x2 gen() 7570 MB/s
[ 4.085410] raid6: sse2x2 xor() 4880 MB/s
[ 4.111409] raid6: sse2x1 gen() 6484 MB/s
[ 4.137402] raid6: sse2x1 xor() 4412 MB/s
These are results for this machine:
[ 17.707948] raid6: sse2x4 gen() 12196 MB/s
[ 17.871946] raid6: sse2x4 xor() 8169 MB/s
[ 18.039947] raid6: sse2x2 gen() 10035 MB/s
[ 18.195950] raid6: sse2x2 xor() 6954 MB/s
[ 18.343951] raid6: sse2x1 gen() 7983 MB/s
[ 18.495948] raid6: sse2x1 xor() 6089 MB/s
[ 18.577606] raid6: using algorithm sse2x4 gen() 12196 MB/s
[ 18.675268] raid6: .... xor() 8169 MB/s, rmw enabled
[ 18.774428] raid6: using ssse3x2 recovery algorithm
For the next step, could you please try the following the beginning of
--assemble
run?
trace.py -M 10 'r::r5l_recovery_verify_data_checksum()(retval != 0)'
Thanks,
Song
Will do and report.
PS: Some key functions here are inlined and thus not easily traceable. We will
probably need to patch the kernel for further debugging.
Won't be a problem.
