I Spoke too early its not fixed.Any one have other options
On 05/09/2011 11:37 PM, Ali Ahsan wrote:
Things i have done to solve this issue is
set swappiness to 0 and i have changed scheduler to anticipatory for
better performance .I don't see kswpad process taking 100% CPU now.
--
S.Ali
I Spoke too early its not fixed.Any one have other options
On 05/09/2011 11:37 PM, Ali Ahsan wrote:
Things i have done to solve this issue is
set swappiness to 0 and i have changed scheduler to anticipatory for
better performance .I don't see kswpad process taking 100% CPU now.
We had a
On Saturday, May 07, 2011 09:35:48 PM Ali Ahsan wrote:
Hi All
I have xeon server with 16 Gb Ram and no Swap memory.I am running
cassandra server on two node in cluster.When there is high load on
server kswapd0 kicks inn and take 100% cpu and make machine very slow
and we need to restart out
Thanks for reply,I dont know it has some thing to do with linux
scheduler but some on suggested about linux scheduler cat
/sys/block/sda/queue/scheduler there are quite few of them noop
[anticipatory] deadline cfq.I have changed from cfq default to
anticipatory,Now problem is less for me
Please don't top-post it's hard to follow.
On Monday, May 09, 2011 03:07:57 PM Ali Ahsan wrote:
Thanks for reply,I dont know it has some thing to do with linux
scheduler but some on suggested about linux scheduler cat
/sys/block/sda/queue/scheduler there are quite few of them noop
On 05/09/2011 08:09 PM, Peter Kjellström wrote:
This means that you're limiting the amount of RAM that can be used as
pagecache (basically caching I/O) to 10%. This may not be an issue for you but
may also severely limit your performance (all depending on work load).
An alternative may be to
On Monday, May 09, 2011 11:49:26 AM Ali Ahsan wrote:
Hmmm nice points,I am using Sata with LVM with 1 TB of two HD.
What sort of SATA drives are you using? There are some known issues with some
SATA drives in certain configurations and on some controllers. It shouldn't
cause kswapd to hit
On 05/09/2011 09:45 PM, Lamar Owen wrote:
What sort of SATA drives are you using? There are some known issues with
some SATA drives in certain configurations and on some controllers. It
shouldn't cause kswapd to hit high CPU, but it is worth checking out.
these modules are loaded when i
On 05/09/2011 10:08 PM, Ali Ahsan wrote:
On 05/09/2011 09:45 PM, Lamar Owen wrote:
What sort of SATA drives are you using? There are some known issues with
some SATA drives in certain configurations and on some controllers. It
shouldn't cause kswapd to hit high CPU, but it is worth
On 05/09/2011 10:11 PM, Ali Ahsan wrote:
What sort of SATA drives are you using? There are some known issues with some SATA drives in certain configurations and on some controllers. It shouldn't cause kswapd to hit high CPU, but it is worth checking
Actually i dont have any issue with read and write,If you
have experience with Cassandra NoSQL database,Its very read
and write intensive.It will approximately doing 10 Million
concurrent read and writes.AS per Cassandra documentation
Cassandra can write 50GB of data in 0.12
On Monday, May 09, 2011 01:11:17 PM Ali Ahsan wrote:
sd 0:0:0:0: Attached scsi disk sda
Vendor: ATA Model: WDC WD10EARS-003 Rev: 80.0
Type: Direct-Access ANSI SCSI revision: 05
Are your two drives in a RAID? cat /proc/mdstat
The WD10EARS drives are known
On 05/09/2011 10:46 PM, Brunner, Brian T. wrote:
50GB in 0.12 ms is 500TB in 1.2 second.
SATA III buses at 6GB/sec need a parallelness of (nearly) 100 channels
to soak up that data.
How many drives must be written-to in parallel to sustain that write
rate is ... Beyond my math skills.
Its
On 05/09/2011 10:51 PM, Lamar Owen wrote:
On Monday, May 09, 2011 01:11:17 PM Ali Ahsan wrote:
sd 0:0:0:0: Attached scsi disk sda
Vendor: ATA Model: WDC WD10EARS-003 Rev: 80.0
Type: Direct-Access ANSI SCSI revision: 05
Are your two drives in a RAID? cat
On 05/09/2011 10:51 PM, Lamar Owen wrote:
iostat -x 1
I am little new to iostat please guide me on this
This is iostat output
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz
avgqu-sz await svctm %util
sda 0.00 0.00 0.00 0.00 0.00 0.00
-Original Message-
From: centos-boun...@centos.org
[mailto:centos-boun...@centos.org] On Behalf Of Ali Ahsan
Sent: Monday, May 09, 2011 1:52 PM
To: centos@centos.org
Subject: Re: [CentOS] kswapd taking 100% cpu with no swap on system
On 05/09/2011 10:46 PM, Brunner, Brian T
On Monday, May 09, 2011 01:57:54 PM Ali Ahsan wrote:
On 05/09/2011 10:51 PM, Lamar Owen wrote:
On Monday, May 09, 2011 01:11:17 PM Ali Ahsan wrote:
sd 0:0:0:0: Attached scsi disk sda
Vendor: ATA Model: WDC WD10EARS-003 Rev: 80.0
Type: Direct-Access
On 05/09/2011 11:06 PM, Lamar Owen wrote:
Can you give the output of pvdisplay, vgdisplay, and lvdisplay?
Also, did you align the pv's to 4K sectors when you partitioned?
What does iostat -x tell you?
pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name
On Monday, May 09, 2011 02:06:54 PM Lamar Owen wrote:
The particular drives (hardware) you are using have known performance issues;
there are a number of reports in Western Digital's forums confirming this,
for more than just Linux.
For reference:
On Monday, May 09, 2011 02:02:08 PM Ali Ahsan wrote:
On 05/09/2011 10:51 PM, Lamar Owen wrote:
iostat -x 1
I am little new to iostat please guide me on this
[snip]
avg-cpu: %user %nice %system %iowait %steal %idle
34.790.001.256.110.00 57.86
Device:
On Monday, May 09, 2011 02:03:54 PM Brunner, Brian T. wrote:
...a pursuit after feral aquatic fowl.
For those for whom English is not their first language, this translates to
'wild goose chase' which term see in wikipedia.org.
___
CentOS mailing list
Things i have done to solve this issue is
set swappiness to 0 and i have changed scheduler to anticipatory for
better performance .I don't see kswpad process taking 100% CPU now.
--
S.Ali Ahsan
Senior System Engineer
e-Business (Pvt) Ltd
49-C Jail Road, Lahore, P.O. Box 676
Lahore 54000,
Hi All
I have xeon server with 16 Gb Ram and no Swap memory.I am running
cassandra server on two node in cluster.When there is high load on
server kswapd0 kicks inn and take 100% cpu and make machine very slow
and we need to restart out cassandra server.I have latest kernel
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