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idata
Community Manager
2,499 Views

High latency for disk activity while writing file intel 80gb G1

I was writing a large file to my ssd and my system was basically crippled because the response time for programs went from the usual <=3ms to a peak of 817ms. I got this info from the disk activity tab under performance monitor. I've also noticed that when the drive stutters, it's because the latency increases to ~500ms. Is there a fix for this because buying another ssd with say a SF controller? I'm using a lattitude e6410 with the latest intel ahci drivers installed.

14 Replies
idata
Community Manager
142 Views

1) How long has the drive been in use?

2) How much free space did you have left on the SSD?

3) How big was the file?

It sounds like the SSD is out of clean blocks. Since there are no more clean blocks, the SSD has to read-modify-write and this leads to the classic symptom of high latency. This issue was resolved with newer SSD controllers with the implementation of a function called TRIM. Pretty much all controllers in the last 2 years support TRIM. Unfortunately, your SSD does not support TRIM or the Intel SSD Optimizer.

The only solution to resolve this problem for a few months is:

1) Take an image of current disk

2) Do a full reformat of the SSD

3) Apply image.

Here is the explaination of the issue in detail: http://www.anandtech.com/show/2738/8 http://www.anandtech.com/show/2738/8

idata
Community Manager
142 Views

1) about 2 months since the last format

2) 23GB

3) 14GB

shouldn't garbage collect take care the drive though? it's had 23GB free for a few weeks.

idata
Community Manager
142 Views

bah, it logged me out. ^ post is mine. the drive stuttered after my fresh format anyway. performed a full one using w7 on another comp

idata
Community Manager
142 Views

Guest wrote:

1) about 2 months since the last format

2) 23GB

3) 14GB

shouldn't garbage collect take care the drive though? it's had 23GB free for a few weeks.

What kind of format did you apply? A quick one?

Definitely sounds like a not enough clean blocks issue.

Intel SSDs do not implement garbage collection. If you have 23GB of dirty blocks, you will continue to have 23GB of dirty blocks.

You could attempt a "Tony TRIM": http://www.ocztechnologyforum.com/forum/showthread.php?64753-A-simple-guide-for-speeding-up-EOL-OCZ-... http://www.ocztechnologyforum.com/forum/showthread.php?64753-A-simple-guide-for-speeding-up-EOL-OCZ-....

idata
Community Manager
142 Views

I would strongly recommend not doing that. I haven't tried it myself but users on other forums have said that whilst it works to some extent on OCZ drives it has the opposite effect on Intel drives.

idata
Community Manager
142 Views

Could you run an AS SSD benchmark and post the results?

http://www.alex-is.de/PHP/fusion/downloads.php?cat_id=4 http://www.alex-is.de/PHP/fusion/downloads.php?cat_id=4

Do you have write caching enabled?

Also try a secure erase:

http://www.pcper.com/article.php?aid=669&type=expert&pid=6 http://www.pcper.com/article.php?aid=669&type=expert&pid=6

It's sad that Intel chose not to provide TRIM functionality for the G1 drives.

idata
Community Manager
142 Views

write cache is enabled. i ran the optimizer thing in the ssd toolbox. an error popped up for the read access time

access times went up to 2.2s for the 4k-64thrd part

idata
Community Manager
142 Views

Boy that sucks. I'd run a secure erase to see if that clears it up. If that fails to improve things something other than the SSD may be at play.

Do you write heavily to the drive all the time?

EDIT: I see you are using MSACHI drivers. (Standard Win 7 default) If a secure erase resolves the problem I'd switch over to the latest Intel RST drivers. (Assuming you have Intel chipsets.)

idata
Community Manager
142 Views

A secure erase will work.

A G1 should eventually recover but when results are this low, secure erase is the only sensible option.

idata
Community Manager
142 Views

redux wrote:

I would strongly recommend not doing that. I haven't tried it myself but users on other forums have said that whilst it works to some extent on OCZ drives it has the opposite effect on Intel drives.

It was a matter of last resort other than zeroing the drive out. It already is pretty bad.

idata
Community Manager
142 Views

Use Ccleaner to wipe/erase the drive free space.

idata
Community Manager
142 Views

when i hover over the msahci thing in the probram, it shows the intel chipset ahci driver, but hwen i check the drive under manage computer computer, it says it's the ms controller. seems kinda retarded that the only way to restore performance for a 2 month old drive is to erase it and copy the drive image over... here's atto btw. doens't seem like that as ssd thing shows the whole story.

mmokk
New Contributor II
142 Views

the secure erase will restore performance*, guaranteed. anything else is 'maybe it will work, maybe not'.

given the choice between a 100% probability of positive outcome, and 50/50, this should be a no-brainer.

do check your firmware version first though, and update it if it's not the latest (8820)

* be aware that many laptops castrate sata performance. it's possible you will never see your g1 perform as well in your laptop as it would in a desktop. the secure erase should still reduce the high latency, though.

idata
Community Manager
142 Views

ccleaner will, it's not maybe it will work.

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