How can I determine/increase ramsize?

[Larry D Sorensen]

Shouldn't your count be a minimum of 98304? bs is in bytes.

On Wed, 10 Jan 2007 18:09:53 -0600 "Supriya Sriraman"
<sriraman.supriya at gmail.com> writes:
> I want to determine and increase ram size on RHEL 4.
> 
> Can anyone help me with this?
> 
> I need 96MB, so I used a bs of 1024 and count of 93750 for the dd 
> command.
> It failed.
> 
> FAILS (RHEL 4)
> ==============
> dd if=/dev/zero of=/dev/ram1 bs=1024 count=93750
> dd: writing `/dev/ram1': No space left on device
> 16385+0 records in
> 16384+0 records out
> 
> dd if=/dev/zero of=/dev/ram1 bs=1024 count=16385
> dd: writing `/dev/ram1': No space left on device
> 16385+0 records in
> 16384+0 records out
> 
> Count of 16384 works, but nothing higher does.
> 
> WORKS (RHEL 4)
> ==============
> dd if=/dev/zero of=/dev/ram1 bs=1024 count=16384
> 16384+0 records in
> 16384+0 records out
> 
> dd if=/dev/zero of=/dev/ram2 bs=1024 count=16384
> 16384+0 records in
> 16384+0 records out
> 
> $ cat /proc/meminfo
> MemTotal:     16574352 kB
> MemFree:      14907316 kB
> Buffers:        253092 kB
> Cached:         729308 kB
> SwapCached:        140 kB
> Active:         865416 kB
> Inactive:       272900 kB
> HighTotal:    15794176 kB
> HighFree:     14891264 kB
> LowTotal:       780176 kB
> LowFree:         16052 kB
> SwapTotal:    20414456 kB
> SwapFree:     20414316 kB
> Dirty:               8 kB
> Writeback:           0 kB
> Mapped:         195864 kB
> Slab:           496572 kB
> CommitLimit:  28701632 kB
> Committed_AS:   447724 kB
> PageTables:       5084 kB
> VmallocTotal:   106488 kB
> VmallocUsed:     12016 kB
> VmallocChunk:    94152 kB
> HugePages_Total:     0
> HugePages_Free:      0
> Hugepagesize:     2048 kB
> $ free
>              total       used       free     shared    buffers     
> cached
> Mem:      16574352    1667100   14907252          0     253092     
> 729308
> -/+ buffers/cache:     684700   15889652
> Swap:     20414456        140   20414316
> 
> I have a machine with a Debian distribution on which the dd command 
> with
> 24 count=93750:
> 
> DEBIAN:
> dd if=/dev/zero of=/dev/ram1 bs=1024 count=93750
> 93750+0 records in
> 93750+0 records out
> 
> 
> $ cat
> /proc/meminfo
> 
>         total:    used:    free:  shared: buffers:  cached:
> Mem:  1585790976 1579163648  6627328        0 33210368 1361088512
> Swap: 1073733632 14704640 1059028992
> MemTotal:      1548624 kB
> MemFree:          6472 kB
> MemShared:           0 kB
> Buffers:         32432 kB
> Cached:        1327956 kB
> SwapCached:       1232 kB
> Active:         938112 kB
> Inactive:       428852 kB
> HighTotal:     1048576 kB
> HighFree:         2860 kB
> LowTotal:       500048 kB
> LowFree:          3612 kB
> SwapTotal:     1048568 kB
> SwapFree:      1034208 kB
> $
> free
> 
>              total       used       free     shared    buffers     
> cached
> Mem:       1548624    1542228       6396          0      32432    
> 1328008
> -/+ buffers/cache:     181788    1366836
> Swap:      1048568      14360    1034208
> 
> 
> Thanks!
> -- 
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