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Re: 0:tcpsndbuf running full [was: Could NPTL cause problems?] [message #2482 is a reply to message #2443] Fri, 07 April 2006 16:57 Go to previous messageGo to previous message
mephisto is currently offline  mephisto
Messages: 34
Registered: February 2006
Member
OK, I narrowed it down. First of all I'm still unable to use i2o_block, but that's also the case for vanilla kernels, so I gave it up for now.

More importantly I was finally able to diagnose my crashes. I watched the host closely while it was under heavy network load (samba mostly and some rsync). When the errors appeared (network connection very slow, until the host is unreachable). I checked /proc/user_beancounters and found this:
Version: 2.5
       uid  resource           held    maxheld    barrier      limit    failcnt
         0: kmemsize        5500576    9732444 2147483647 2147483647          0
            lockedpages        1027       1027 2147483647 2147483647          0
            privvmpages       19654      53732 2147483647 2147483647          0
            shmpages           1326       1345 2147483647 2147483647          0
            dummy                 0          0 2147483647 2147483647          0
            numproc              64        153 2147483647 2147483647          0
            physpages          5236      16629 2147483647 2147483647          0
            vmguarpages           0          0 2147483647 2147483647          0
            oomguarpages       5280      16673 2147483647 2147483647          0
            numtcpsock           23        109 2147483647 2147483647          0
            numflock             66        569 2147483647 2147483647          0
            numpty                2          2 2147483647 2147483647          0
            numsiginfo            0         69 2147483647 2147483647          0
            tcpsndbuf    2147163432 2147486264 2147483647 2147483647       2898
            tcprcvbuf         13112     843416 2147483647 2147483647          0
            othersockbuf      44320    2678104 2147483647 2147483647          0
            dgramrcvbuf           0      26960 2147483647 2147483647          0
            numothersock         34         50 2147483647 2147483647          0
            dcachesize      3643446    4167100 2147483647 2147483647          0
            numfile             535       2536 2147483647 2147483647          0
            dummy                 0          0 2147483647 2147483647          0
            dummy                 0          0 2147483647 2147483647          0
            dummy                 0          0 2147483647 2147483647          0
            numiptent             0          0 2147483647 2147483647          0
       101: kmemsize        5550088    5980112  105495756  116045331          0
            lockedpages           0          0       5151       5151          0
            privvmpages      311785     386062 2147483647 2147483647          0
            shmpages           2655       3295       7726       7726          0
            dummy                 0          0          0          0          0
            numproc             163        178       8000       8000          0
            physpages         66399      67751          0 2147483647          0
            vmguarpages           0          0      77267 2147483647          0
            oomguarpages      66399      67751     200000 2147483647          0
            numtcpsock           20         31       8000       8000          0
            numflock             14         21       1000       1100          0
            numpty                0          1        512        512          0
            numsiginfo            0          3       1024       1024          0
            tcpsndbuf       3239936    3333776   23792300   35147230          0
            tcprcvbuf          1192     159528    2397252   35165252          0
            othersockbuf      28128      85104   20480000 2147483647          0
            dgramrcvbuf           0     243168    1198626    1198626          0
            numothersock         24         53       8000       8000          0
            dcachesize       402711     456183   23031052   23721984          0
            numfile            3530       4337      41184      41184          0
            dummy                 0          0          0          0          0
            dummy                 0          0          0          0          0
            dummy                 0          0          0          0          0
            numiptent             0          0        200        200          0

So the host's tcpsndbuf is running full. I should mention that I moved eth1 to the vps with NETDEV="eth1". This is the major configuration difference to my test system that runs fine with a venet0 interface.
The error also occured without the vps loaded and traffic occuring just on the not virtualized eth0 interface. I've seen the error with 2.6.15-025stab014 and 2.6.16-026stab007. Do you need any more information?

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