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Date: Mon, 6 Nov 2006 09:48:42 +0100 From: Eric Dumazet <dada1@...mosbay.com> To: "Zhao Xiaoming" <xiaoming.nj@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: ZONE_NORMAL memory exhausted by 4000 TCP sockets On Monday 06 November 2006 09:10, Zhao Xiaoming wrote: > > Thanks for the answer. I know it's more likely relats to netdev. > However, it's always a strange thing to have 400~500M bytes LOWMEM > 'gone' while it's not reported to be occupied by slab. Both meminfo > and buddyinfo tell the same. > > with traffics of 2000 concurrent sessions: Slab: 293952 kB So 292 MB used by slab for 2000 sessions. Expect 600 MB used by slab for 4000 sessions. So your precious LOWMEM is not gone at all. It *IS* used by SLAB. You forgot to send cat /proc/slabinfo > > cat /proc/meminfo > MemTotal: 4136580 kB > MemFree: 3298460 kB > Buffers: 4096 kB > Cached: 21124 kB > SwapCached: 0 kB > Active: 47416 kB > Inactive: 12532 kB > HighTotal: 3276160 kB > HighFree: 3214592 kB > LowTotal: 860420 kB > LowFree: 83868 kB > SwapTotal: 0 kB > SwapFree: 0 kB > Dirty: 12 kB > Writeback: 0 kB > Mapped: 42104 kB > Slab: 293952 kB > CommitLimit: 2068288 kB > Committed_AS: 58892 kB > PageTables: 1112 kB > VmallocTotal: 116728 kB > VmallocUsed: 2940 kB > VmallocChunk: 110548 kB > HugePages_Total: 0 > HugePages_Free: 0 > Hugepagesize: 2048 kB > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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