dbzdeath
August 19th, 2009, 02:01 PM
Hey,
I noticed recently that my CPU usage goes up to 100% when copying files, this should not be the case as DMA should leave little cpu usage. I first noticed it on my USB flash drive which was copying at only just over 1MB/s and my CPU usage was sitting at 100%(both cores combined), yet there was nothing using the CPU in top. I just tested copying a file from one location to another on the same hard drive (My main SATA drive in my laptop) and a similar result occured, in regards to the CPU usage.
I've seen a few posts from other people reporting similar issues and there is a bug report here https://bugs.launchpad.net/ubuntu/+source/linux/+bug/365775 that has just been ignored basically.
My details follow.
model name : Intel(R) Core(TM)2 Duo CPU T9550 @ 2.66GHz
$ free -m
total used free shared buffers cached
Mem: 1986 1967 19 0 27 1095
-/+ buffers/cache: 844 1141
Swap: 972 14 958
$ uname -a
Linux Lappy 2.6.28-15-generic #48-Ubuntu SMP Wed Jul 29 08:53:35 UTC 2009 x86_64 GNU/Linux
My laptop is an Asus N50VN. Any help would be much appreciated. By the way, I'm far from a Linux n00b. Please post here if you're experiencing similar issues.
I noticed recently that my CPU usage goes up to 100% when copying files, this should not be the case as DMA should leave little cpu usage. I first noticed it on my USB flash drive which was copying at only just over 1MB/s and my CPU usage was sitting at 100%(both cores combined), yet there was nothing using the CPU in top. I just tested copying a file from one location to another on the same hard drive (My main SATA drive in my laptop) and a similar result occured, in regards to the CPU usage.
I've seen a few posts from other people reporting similar issues and there is a bug report here https://bugs.launchpad.net/ubuntu/+source/linux/+bug/365775 that has just been ignored basically.
My details follow.
model name : Intel(R) Core(TM)2 Duo CPU T9550 @ 2.66GHz
$ free -m
total used free shared buffers cached
Mem: 1986 1967 19 0 27 1095
-/+ buffers/cache: 844 1141
Swap: 972 14 958
$ uname -a
Linux Lappy 2.6.28-15-generic #48-Ubuntu SMP Wed Jul 29 08:53:35 UTC 2009 x86_64 GNU/Linux
My laptop is an Asus N50VN. Any help would be much appreciated. By the way, I'm far from a Linux n00b. Please post here if you're experiencing similar issues.