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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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






--
View this message in context: http://linux-kernel.2935.n7.nabble.com/Abysmal-HDD-USB-write-speed-after-sleep-on-a-UEFI-system-tp598586p681610.html
Sent from the Linux Kernel mailing list archive at Nabble.com.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/