I have a new Asus NX500J with a Samsung PCIe SSD with jessie (8.2)
installed and I'm having problems with disc speed. It is supposed to
have up to (write: 930 MB/s read: 1170 MB/s), but I'm seeing performance
that is horrible.
Here is iostat info while doing an aptitude update:
avg-cpu: %user %nice %system %iowait %steal %idle
0.25 0.00 0.75 10.40 0.00 88.60
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 21.00 0.00 5.00 0.00 124.00
49.60 0.95 169.60 0.00 169.60 189.60 94.80
dm-0 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00 0.00
I have read the ssd optimization wiki:
https://wiki.debian.org/SSDOptimization
I have tried some of the suggestions, but I believe this issue is beyond
those suggestions.
To do any trivial thing it takes a long time. I believe it it related
to the known ssd issues with certain brands including samsung. However
it's not mentioned here:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/ata/libata-core.c#n4220
What tests should I do to narrow down the problem? Where should I
report it?
Thank you
