Re: ssd issues
On 01/21/2016 08:15 PM, Banio wrote:
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
To answer my own question. The issue was a IRQ conflict between the
nvidia graphics card and ssd.
I needed to boot the machine with nomodeset kernel option to make it usable:
reboot on the grub screen press "e" on the option you want to edit
go down to the line that says linux at the end of that line append
"nomodeset" press F10 to boot
Now uninstall the nouveau driver and any nvidia stuff you may have:
aptitude remove nouveau* nvidia*
install the bumblebee proprietary driver:
aptitude install bumblebee-nvidia primus
restart
You should be good to go
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