RE: buffer cache question

[Roger Heflin]

> -----Original Message-----
> From: linux-kernel-owner@xxxxxxxxxxxxxxx 
> [mailto:linux-kernel-owner@xxxxxxxxxxxxxxx] On Behalf Of JaniD++
> Sent: Sunday, December 18, 2005 3:09 PM
> To: linux-kernel@xxxxxxxxxxxxxxx
> Subject: buffer cache question
> 
> Hello, list,
> 
> I use 4 disk nodes with NBD.
> All of my nodes have 2GB ram.
> 
> But the buffer cache newer rise over 830MB.
> 
> Is there some limit?

For writes only 40% of the ram can be "dirty".

> Where can i change this limit? (if it is)

I believe there is a way to change it, I am pretty sure that it has
been discussed on the kernel list a couple of months ago, I 
don't remember exactly what the change is, and I think the change
was more complicated that was obvious.

The previous subject on a similar thing was:
"kernel 2.6.13 buffer strangeness"

                           Roger

> 
> Thanks,
> Janos
> 
> [root@st-0001 root]# free
>              total       used       free     shared    
> buffers     cached
> Mem:       2073152     933188    1139964          0     
> 836776      43416
> -/+ buffers/cache:      52996    2020156
> Swap:            0          0          0
> [root@st-0001 root]# cat /proc/meminfo
> MemTotal:      2073152 kB
> MemFree:       1139012 kB
> Buffers:        835928 kB
> Cached:          43448 kB
> SwapCached:          0 kB
> Active:          12872 kB
> Inactive:       871424 kB
> HighTotal:     1179584 kB
> HighFree:      1129764 kB
> LowTotal:       893568 kB
> LowFree:          9248 kB
> SwapTotal:           0 kB
> SwapFree:            0 kB
> Dirty:               0 kB
> Writeback:           0 kB
> Mapped:           9104 kB
> Slab:            30248 kB
> CommitLimit:   1036576 kB
> Committed_AS:    15428 kB
> PageTables:        408 kB
> VmallocTotal:   114680 kB
> VmallocUsed:       196 kB
> VmallocChunk:   114476 kB
> [root@st-0001 root]#
> 
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