That's at boot time.... Linux reserves (caches) memory to be quickly allocated out to applications. That's why top shows a ton of it used. That is normal.... Free will show you the actual used memory. And you do not need the hugemem kernel unless you have more than 64GB RAM, if I remember correctly. Same thing with the largesmp kernel, only needed if you have more than 64 processors. Thanks, Tom Callahan On 3/16/07 6:32 AM, "Nuwan" <nrfromlk@xxxxxxxxx> wrote: > Try the following ; > > # dmesg | grep Memory: > > Memory: 2071680k/2097088k available (1848k kernel code, 24692k > reserved, 752k data, 184k init, 0k highmem) > > This will gave u enough understanding about the linux available memory ! > > > On 3/16/07, baran.yurdagul@xxxxxxxxxxxxxxx > <baran.yurdagul@xxxxxxxxxxxxxxx> wrote: >> Hi, >> If you look at the free output you will see that altough 162M of your memory >> is free, the cached memory is ~15GB which means kernel is ready for giving >> that area to any application that needs memory. Linux has allocated that >> memoy for some reason, and if it is needed it can give it back. >> I hope I am clear enough. >> >> >> >> -----Original Message----- >> From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list-bounces@xxxxxxxxxx] >> On Behalf Of qua nong >> Sent: Friday, March 16, 2007 6:50 AM >> To: General Red Hat Linux discussion list >> Subject: Re: RHEL 4 - Memory Problem >> >> Hi, >> >> Below is the output of free >> >> # free >> total used free shared buffers >> cached >> Mem: 16360260 16197904 162356 0 256496 14974144 >> -/+ buffers/cache: 967264 15392996 >> Swap: 33551744 186960 33364784 >> >> May I also ask you that as you mentioned that you run Oracle RAC on linux >> box. Do you use RHEL3 cluster or 4, GFS or OCFS ? >> >> Qua >> >> >> ----- Original Message ---- >> From: Troy Knabe <knabe@xxxxxxxxxxx> >> To: General Red Hat Linux discussion list <redhat-list@xxxxxxxxxx> >> Sent: Friday, March 16, 2007 3:20:02 PM >> Subject: Re: RHEL 4 - Memory Problem >> >> Try running the command "free" I think, although I don't know why and would >> love for someone on this list to answer this question that this is a better >> actual representation of the free memory on the box. >> >> I am running the same config as you, only 3 boxes with 8 gig of RAM each and >> Oracle RAC. >> >> My hunch is that top and vmstat are showing the actual memory locations that >> are empty, where a "free" command shows the memory addresses that while may >> have something in them, are able to be recycled and used. >> >> Can someone verify that I am right or way off base? >> >> Thanks >> -Troy >> >> >> ----- Original Message ----- >> From: qua nong <quanong_os@xxxxxxxxx> >> Date: Thursday, March 15, 2007 9:02 pm >> Subject: RHEL 4 - Memory Problem >> To: redhat-list@xxxxxxxxxx >> >>> Hi list, >>> >>> We have a AMD with RHEL4 64 installed and the Oracle 10g installed as >>> well. >>> It has the latest kernel update 2.6.9-42.0.8.ELsmp but the memory is >>> always being used by some unexplained processes. >>> >>> There are 4 CPUs, 16 GB RAM, 33GB swap but memory used = 16148872k >>> >>> Even when oracle is shutdown, a memory use is still nearly 16GB. CPU >>> is 99.4 % in idle, and I/O is too quiet. This is quite difficult to >>> explain. >>> >>> Could anyone have any idea ? >>> >>> Here is the display of the top command >>> >>> top - 14:57:33 up 30 days, 22:29, 3 users, load >>> average: 0.22, 0.10, 0.02 >>> Tasks: 121 total, 1 running, 120 >>> sleeping, 0 stopped, 0 zombie >>> Cpu(s): 0.0% us, 0.0% sy, 0.0% ni, 99.4% id, 0.6% wa, 0.0% hi, >>> 0.0% si >>> Mem: 16360260k total, 16198280k used, 161980k >>> free, 256496k buffers >>> Swap: 33551744k total, 186960k used, 33364784k free, >>> 14973940k cached >>> >>> vmstat 2 >>> procs -----------memory---------- ---swap-- -----io---- --system- >>> - ----cpu---- >>> r b swpd free >>> buff cache si so >>> bi bo in cs us >>> sy id wa >>> 0 0 186960 161420 256496 14973940 >>> 0 0 1 >>> 112 3 1 0 >>> 0 99 1 >>> 0 0 186960 162284 256496 14973940 >>> 0 0 0 170 >>> 1021 2162 0 0 100 0 >>> 0 0 186960 162276 256496 14973940 >>> 0 0 >>> 0 44 1009 2149 0 0 100 0 >>> 0 0 186960 162284 256496 14973940 >>> 0 0 >>> 0 42 1008 2244 0 0 99 0 >>> 0 0 186960 162292 256496 14973940 >>> 0 0 >>> 0 48 1011 2164 0 0 99 0 >>> 0 0 186960 162292 256496 14973940 >>> 0 0 >>> 0 56 1006 2118 0 0 100 0 >>> 0 0 186960 162292 256496 14973940 >>> 0 0 >>> 0 66 1011 2154 0 0 98 2 >>> >>> >>> >>> cat /proc/meminfo >>> MemTotal: 16360260 kB >>> MemFree: 162740 kB >>> Buffers: 256496 kB >>> Cached: 14973940 kB >>> SwapCached: 9724 kB >>> Active: 2709340 kB >>> Inactive: 12799980 kB >>> HighTotal: 0 kB >>> HighFree: 0 kB >>> LowTotal: 16360260 kB >>> LowFree: 162740 kB >>> SwapTotal: 33551744 kB >>> SwapFree: 33364784 kB >>> Dirty: 332 kB >>> Writeback: 140 kB >>> Mapped: 1147256 kB >>> Slab: 608056 kB >>> CommitLimit: 41731872 kB >>> Committed_AS: 7853044 kB >>> PageTables: 39080 kB >>> VmallocTotal: 536870911 kB >>> VmallocUsed: 16760 kB >>> VmallocChunk: 536854071 kB >>> HugePages_Total: 0 >>> HugePages_Free: 0 >>> Hugepagesize: 2048 kB >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> ______________________________________________________________________ >>> ______________ >>> Never miss an email again! >>> Yahoo! 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