Q about swap size
jd1008 at gmail.com
Sun Jul 11 16:01:19 UTC 2010
On 07/11/2010 09:10 AM, Robert G. (Doc) Savage wrote:
> I've been running Fedora on my old Thinkpad A22p (P-III/M w/512MB)
> since FC4 or before, upgrading from one version to the next using the
> same partition sizes. For F13 I increased the size of /boot, but kept
> swap at 1GB:
> # fdisk -l /dev/sda
> Disk /dev/sda: 120.0 GB, 120034123776 bytes
> 255 heads, 63 sectors/track, 14593 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x000304c6
> Device Boot Start End Blocks Id System
> /dev/sda1 * 1 64 512000 83 Linux
> Partition 1 does not end on cylinder boundary.
> /dev/sda2 64 14463 115658752 83 Linux
> /dev/sda3 14463 14594 1048576 82 Linux swap / Solaris
> The last couple of releases have run agonizingly slowly with very high
> load averages (between 2.x and 10.x).
> I just read
> which recommends a minimum of 2GB swap size for memory sizes up to
> 4GB. I've been using 2x RAM for swap size ever since the 2.6 kernel
> was introduced. At the moment (running 'yumex') 'top' indicates:
> top - 10:43:15 up 2 days, 6 min, 5 users, load average: 8.62, 6.84, 6.26
> Tasks: 244 total, 7 running, 237 sleeping, 0 stopped, 0 zombie
> Cpu(s): 60.7%us, 23.5%sy, 9.2%ni, 0.0%id, 0.0%wa, 5.4%hi, 1.3%si, 0.0%st
> Mem: 509800k total, 502624k used, 7176k free, 16280k buffers
> Swap: 1048568k total, 317372k used, 731196k free, 101944k cached
> This indicates only about 30% of my 1GB swap is being used. Would
> increasing that to 2GB have any affect on the load average performance?
> --Doc Savage
> Fairview Heights, IL
With only half a gig of ram, you will end up thrashing like crazy.
Of course you will have a high load factor.
How about putting in it the maximum amount of ram the notebook can handle.
Ram is cheap now!
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