Bug 250418

Summary: huge load on every file transfer, impossible to turn on dma
Product: [Fedora] Fedora Reporter: Istvan Szukacs <lix>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED INSUFFICIENT_DATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: low    
Version: 7CC: chris.brown
Target Milestone: ---   
Target Release: ---   
Hardware: ppc64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2008-01-10 19:11:25 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Istvan Szukacs 2007-08-01 14:10:02 UTC 
Description of problem:

huge load on every file transfer, impossible to turn on dma

Version-Release number of selected component (if applicable):

Linux cell 2.6.21-1.3194.fc7 #1 SMP Wed May 23 22:13:52 EDT 2007 ppc64 ppc64
ppc64 GNU/Linux


SCSI subsystem initialized
scsi0 : pata_sil680
scsi1 : pata_sil680
scsi 0:0:0:0: Direct-Access     ATA      FUJITSU MHV2040A 0000 PQ: 0 ANSI: 5
SCSI device sda: 78140160 512-byte hdwr sectors (40008 MB)
SCSI device sda: write cache: enabled, read cache: enabled, doesn't support DPO
or FUA
SCSI device sda: 78140160 512-byte hdwr sectors (40008 MB)
SCSI device sda: write cache: enabled, read cache: enabled, doesn't support DPO
or FUA
sd 0:0:0:0: Attached scsi disk sda
sd 0:0:0:0: Attached scsi generic sg0 type 0


How reproducible:

just copy huge files to somewhere on the hdd

Steps to Reproduce:
1. cp hugefile /tmp
2.
3.
  
Actual results:

load average around 7.0

Expected results:

load average around 0.0 :_)
Additional info:

[root@cell ~]# hdparm -cuda /dev/sda

/dev/sda:
 IO_support   =-1750268 (???)
 readahead    = 256 (on)

[root@cell ~]# lsmod |grep libata
libata                178545  2 ata_generic,pata_sil680
scsi_mod              231985  3 sg,libata,sd_mod
Comment 1 Christopher Brown 2007-09-21 13:46:42 UTC 
Hello,

I'm reviewing this bug as part of the kernel bug triage project, an attempt to
isolate current bugs in the fedora kernel.

http://fedoraproject.org/wiki/KernelBugTriage

I am CC'ing myself to this bug and will try and assist you in resolving it if I can.

There hasn't been much activity on this bug for a while. Could you tell me if
you are still having problems with the latest kernel? If so, it may be helpful
to attach the output of:

# lspci -vvxxx

so the developers are able to debug your issue quicker.

If the problem no longer exists then please close this bug or I'll do so in a
few days if there is no additional information lodged.

Cheers
Chris
Comment 2 Christopher Brown 2008-01-10 19:11:25 UTC 
Hello,

I'm reviewing this bug as part of the kernel bug triage project, an attempt to
isolate current bugs in the Fedora kernel.

http://fedoraproject.org/wiki/KernelBugTriage

I am CC'ing myself to this bug and will try and assist you in resolving it if I can.

There hasn't been much activity on this bug for a while. Could you tell me if
you are still having problems with the latest kernel?

If the problem no longer exists then please close this bug or I'll do so in a
few days if there is no additional information lodged.