No swap being used

Mailing List

Home

Forum Home

Linux - General Red Hat Linux discussion list

Installation - Getting started with Red Hat Linux

Enterprise Linux 3 - Discussion of Red Hat Enterprise Linux 3 (Taroon)

Red Hat Linux 9 - Discussion of Red Hat Linux 9 (Shrike)

Red Hat Linux 7.3 - Discussion of Red Hat Linux 7.3 (Valhalla)

Red Hat Linux 7.2 - Discussion of Red Hat Linux 7.2 (Enigma)

Apache Web Server

Oracle database, Microsoft SQL server ...

Subjects

•	application/x mplayer2 plugin
•	RPM error: db4 error(16) from dbenv >remove: Device or resource busy
•	Command stream end of file while reading
•	X Windows problem (xauth)
•	Upgrading openoffice 1 1 rpm
•	FTP: connection refused
•	FTP: connection refused
•	mount: /dev/cdrom: is not a valid block device
•	Dell Precision 650, RedHat 9, no sound
•	how to trace the cause resulting in the crash of bind server
•	Virus on the list
•	UNINSTALL RPM MYSQL
•	usb pen drives: mounting as a user
•	broadcom network interface
•	make mrproper
•	sendmail configuration on redhat
•	Couldn 't open PID file /var/run/named/named pid Permission denied
•	Promise 378 controller
•	kernel 2 6 and /dev/sound/mixer not found
•	Problem using up2date
•	mrtg step by step howto/configuration for a newbie?
•	Compiling and Installing Kernel 2 6
•	Can 't locate module ppp0, can 't locate module ppp compress 21
•	HOW I CAN MAKE BOOTABLE FLOPPY DISKET
•	Lotus Notes under Wine
•	/etc/security/limits conf question
•	Intel E/1000 driver
•	Command stream end of file while reading
•	rpm database corrupt
•	qla2300 modules

No swap being used

No swap being used

2006-01-12 - By Paul Krizak

Back

Reply: 1 2 3 4 5 6 7 8 9 10 >>

I'd think that *using* swap would be a significant source of slowdowns.
If everything is in memory, then you're in fantastic shape, as far as
I know. Most of our servers never touch the swap partition. We're even
considering running without swap or /tmp in a diskless configuration.

Swap is slow, and the RHEL kernel tries to keep as much stuff in RAM as
possible before resorting to paging to disk. I'd look elsewhere for
your slowdowns.

Paul Krizak 5900 E. Ben White Blvd. MS 625
Advanced Micro Devices Austin, TX 78741
Linux/Unix Systems Engineering Phone: (512) 602-8775
Microprocessor Solutions Sector

Jeff Macfarland wrote:
> Sun V20z, RHEL 3u5, i386 kernel, 12GB RAM, 12GB swap
>
> This box hosts quite a few things, among them serving SunRay's. We've
> been experiencing horrible slowdowns particularly during a cvs checkout.
> Just noticed that NO swap is being used:
>
> output of `free`:
>
> total used free shared buffers cached
> Mem: 12277844 12036764 241080 0 1333552 7502204
> -/+ buffers/cache: 3201008 9076836
> Swap: 12578704 0 12578704
>
> `swapon -s`:
>
> Filename Type Size Used Priority
> /dev/sda2 partition 2096472 0 -1
> /dev/sda3 partition 2096472 0 -2
> /dev/sda5 partition 2096440 0 -3
> /dev/sda6 partition 2096440 0 -4
> /dev/sda7 partition 2096440 0 -5
> /dev/sda8 partition 2096440 0 -6
>
> `dmesg`:
> ...
> Adding Swap: 2096472k swap-space (priority -1)
> Adding Swap: 2096472k swap-space (priority -2)
> Adding Swap: 2096440k swap-space (priority -3)
> Adding Swap: 2096440k swap-space (priority -4)
> Adding Swap: 2096440k swap-space (priority -5)
> Adding Swap: 2096440k swap-space (priority -6)
> ...
>
> `grep swap /etc/fstab`:
> /dev/sda2 swap swap defaults 0 0
> /dev/sda3 swap swap defaults 0 0
> /dev/sda5 swap swap defaults 0 0
> /dev/sda6 swap swap defaults 0 0
> /dev/sda7 swap swap defaults 0 0
> /dev/sda8 swap swap defaults 0 0
>
> Doing `mkswap /dev/sda2; swapon -s` has no effect.
>
> Is there some secret setting to enable swap?
>

--
Taroon-list mailing list
Taroon-list@(protected)
https://www.redhat.com/mailman/listinfo/taroon-list