100% CPU while copying files

**towel401** · 09-13-2005

When ever I copy a file CPU use goes up to 100, from a usb external hdd or just copying between harddrives it always goes to 100. The process using the CPU doesnt show up in top. except kjournald spikes to 30 sometimes. I can copy the files from the network via ftp at about the same speed or faster and hardly any cpu use, except for pdflush spiking every few seconds.

I am using 2.6.11.11 and I remember that it didnt always do it with 2.6.10. also when the cpu does go up my mouse gets really jumpy.

Even speeds like 500k/s it uses 100%. If I use ftp at that speed it uses only a few %. for copying between drives i get speeds of 11mbytes first, thn it kreeps down to 3 or 4. any ideas how to fix this strange behaviour?

**psic** · 09-14-2005

Do you have DMA turned on?

**towel401** · 09-16-2005

yuppers.. at least thats what hdparm tells me.

**Mystic_Slayer** · 09-16-2005

If you have DMA2 you´re transfer rate will be 66, when you´ve got DMA4/5 you´ve got 100/133.

**mfox** · 09-16-2005

Originally Posted by Mystic_Slayer

If you have DMA2 you´re transfer rate will be 66, when you´ve got DMA4/5 you´ve got 100/133.

Where can i change that? i've got the same problem, realy irritating! :P This also happens when i copy from a CD/DVD or if i'm burning a CD/DVD...

**burnit** · 09-16-2005

On shell:

Code:

hdparm -d1 -X 64 &#40;62 * DMA mode... -> this set udma2&#41;

From hdparm configuration file /etc/hdparm.conf:

Code:

/dev/hda &#123;
        transfer_mode = 67
        dma = on
&#125;

**Shamanix** · 09-27-2005

Found out that this only happens with my cd-rom's, while playing a movie/series or while copying. DMA is turned on, but 100% cpu is used... What should i do?

#/dev/cdroms/cdrom0 {
# dma = on
# interrupt_unmask = on
# io32_support = 0
#}

This is further up:
# -d disable/enable the "using_dma" flag for this drive
#dma = off

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