On Wed, Aug 24, 2011 at 9:06 AM, Stefan Priebe - Profihost AG <s.priebe@xxxxxxxxxxxx> wrote: > i hope this is the correct list to write to if it would be nice to give me a > hint where i can ask. > > Kernel: 2.6.38 > > I'm seeing some strange problems on some of our servers after upgrading to > 2.6.38. > > I'm copying a 1GB file via scp from Machine A to Machine B. When B is > freshly booted the file transfer is done with about 80 to 85 Mb/s. I can > repeat that various times to performance degrease. > > Then after some days copying is only done with about 900kb/s up to 3Mb/s > going up and down while transfering the file. > > When i then do drop_caches it works again on 80Mb/s. > > sync && echo 3 >/proc/sys/vm/drop_caches && sleep 2 && echo 0 >>/proc/sys/vm/drop_caches > > Attached is also an output of meminfo before and after drop_caches. > > What's going on here? MemFree is pretty high. > > Please CC me i'm not on list. Interesting. I can imagine one or more of the following to be involved: networking, vmscan, block, and writeback. Lets CC all of them! > # before drop_caches > > # cat /proc/meminfo > MemTotal: 8185544 kB > MemFree: 6670292 kB > Buffers: 105164 kB > Cached: 166672 kB > SwapCached: 0 kB > Active: 728308 kB > Inactive: 567428 kB > Active(anon): 639204 kB > Inactive(anon): 394932 kB > Active(file): 89104 kB > Inactive(file): 172496 kB > Unevictable: 2976 kB > Mlocked: 2992 kB > SwapTotal: 1464316 kB > SwapFree: 1464316 kB > Dirty: 52 kB > Writeback: 0 kB > AnonPages: 1026920 kB > Mapped: 54208 kB > Shmem: 8380 kB > Slab: 80724 kB > SReclaimable: 22844 kB > SUnreclaim: 57880 kB > KernelStack: 2872 kB > PageTables: 35448 kB > NFS_Unstable: 0 kB > Bounce: 0 kB > WritebackTmp: 0 kB > CommitLimit: 5557088 kB > Committed_AS: 6187972 kB > VmallocTotal: 34359738367 kB > VmallocUsed: 292360 kB > VmallocChunk: 34359425327 kB > HardwareCorrupted: 0 kB > DirectMap4k: 5632 kB > DirectMap2M: 2082816 kB > DirectMap1G: 6291456 kB > > # cat /proc/meminfo > MemTotal: 8185544 kB > MemFree: 6888060 kB > Buffers: 372 kB > Cached: 61492 kB > SwapCached: 0 kB > Active: 659156 kB > Inactive: 426664 kB > Active(anon): 638892 kB > Inactive(anon): 395200 kB > Active(file): 20264 kB > Inactive(file): 31464 kB > Unevictable: 2976 kB > Mlocked: 2992 kB > SwapTotal: 1464316 kB > SwapFree: 1464316 kB > Dirty: 0 kB > Writeback: 0 kB > AnonPages: 1026952 kB > Mapped: 54236 kB > Shmem: 8316 kB > Slab: 70616 kB > SReclaimable: 12264 kB > SUnreclaim: 58352 kB > KernelStack: 2864 kB > PageTables: 35448 kB > NFS_Unstable: 0 kB > Bounce: 0 kB > WritebackTmp: 0 kB > CommitLimit: 5557088 kB > Committed_AS: 6187932 kB > VmallocTotal: 34359738367 kB > VmallocUsed: 292360 kB > VmallocChunk: 34359425327 kB > HardwareCorrupted: 0 kB > DirectMap4k: 5632 kB > DirectMap2M: 2082816 kB > DirectMap1G: 6291456 kB > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href