linux-kernel - Re: Abysmal HDD/USB write speed after sleep on a UEFI system

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Message-ID: <1373477126220-681610.post@n7.nabble.com>
Date:	Wed, 10 Jul 2013 10:25:26 -0700 (PDT)
From:	hyphop <email2tema@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: Abysmal HDD/USB write speed after sleep on a UEFI system

hello
i have same problem. low write speed after system sleep 

kernel 3.9.9

i can see it HDD SATA & USB disks to

i try to make another test  

before sleep i make  file /tmp/test ( /tmp mounted as tmpfs size=8G, i have
16G memory in my system )

dd if=/dev/zero bs=1M count=1000 of=/tmp/test 
 ~ 3,2 GB/s
cryptsetup luksFormat /tmp/test
cryptsetup luksOpen /tmp/test test

dd if=/dev/zero bs=1M count=1000 of=/dev/mapper/test
 ~ 465 GB/s good speed 

after sleep

dd if=/dev/zero bs=1M count=1000 of=/dev/mapper/test
 ~ 5MB/s ooops (((( very slow

but if write directly in /tmp i can see 

dd if=/dev/zero bs=1M count=1000 of=/tmp/test2
 ~ 3,2 GB/s

I can see this is not hardware problem (NOT SATA OR USB) i think is kernel
BUG, i i dont have this problem on previous kernel 3.4

Best regards, 

Tema






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