Re: nvme SSD and poor performance
Pierre Willaime wrote:
> Le 17/08/2021 à 14:02, Dan Ritter a écrit :
> > The first question is, how slow is this storage?
> >
> >
> > Here is a good article on using fio:
> > https://arstechnica.com/gadgets/2020/02/how-fast-are-your-disks-find-out-the-open-source-way-with-fio/
>
> Thanks for the help.
>
> Here are the output of fio tests.
>
> Single 4KiB random write process test:
>
> WRITE: bw=197MiB/s (207MB/s), 197MiB/s-197MiB/s (207MB/s-207MB/s),
> io=12.0GiB (12.9GB), run=62271-62271msec
>
> 16 parallel 64KiB random write processes (two different results, further
> tests are closer to the second than the first):
>
> WRITE: bw=523MiB/s (548MB/s), 31.8MiB/s-33.0MiB/s (33.4MB/s-35.6MB/s),
> io=35.5GiB (38.1GB), run=63568-69533msec
>
> WRITE: bw=201MiB/s (211MB/s), 11.9MiB/s-14.8MiB/s (12.5MB/s-15.5MB/s),
> io=14.3GiB (15.3GB), run=60871-72618msec
>
> Single 1MiB random write process:
>
> WRITE: bw=270MiB/s (283MB/s), 270MiB/s-270MiB/s (283MB/s-283MB/s),
> io=16.0GiB (17.2GB), run=60722-60722msec
These numbers look reasonable for a low-end SSD that
manufacturers throw into their laptops -- which is what your
drive is, as far as I can tell. I can't find specs, but I
suspect it is a QLC set with a small DRAM cache.
I don't think you have a significant performance problem, but
you are definitely feeling some pain -- so can you tell us more
about what feels slow? Does it happen during the ordinary course
of the day?
-dsr-
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