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  • ——FreeBSD之All mbuf clusters exhausted問題

    發表于:2007-07-04來源:作者:點擊數: 標簽:
    /kernel: All mbuf clusters exhausted, please see tuning(7). 解決 mail#tail -f /var/log/messages Jul 1 11:28:06 mail /kernel: All mbuf clusters exhausted, please see tuning(7). Jul 1 11:28:06 mail pdns[198]: Error sending reply with sendto (
    /kernel: All mbuf clusters exhausted, please see tuning(7). 解決

    mail#tail -f /var/log/messages
    Jul  1 11:28:06 mail /kernel: All mbuf clusters exhausted, please see tuning(7).
    Jul  1 11:28:06 mail pdns[198]: Error sending reply with sendto (socket=7): No buffer space available
    Jul  1 11:28:07 mail last message repeated 5 times
    Jul  1 11:28:07 mail /kernel: All mbuf clusters exhausted, please see tuning(7).
    Jul  1 11:28:07 mail pdns[198]: Error sending reply with sendto (socket=7): No buffer space available
    Jul  1 11:28:08 mail /kernel: All mbuf clusters exhausted, please see tuning(7).
    Jul  1 11:28:39 mail last message repeated 29 times
    Jul  1 11:30:40 mail last message repeated 105 times
    Jul  1 11:32:52 mail last message repeated 111 times
    Jul  1 12:39:52 mail pdns[198]: On retrieving question of packet from 218.56.161.69, encountered error: Label claims to be longer than packet

    mail# dmesg
    All mbuf clusters exhausted, please see tuning(7).
    All mbuf clusters exhausted, please see tuning(7).
    ...........................

    mail#.netstat -m
    37/3840/10048 mbufs in use (current/peak/max):
            37 mbufs allocated to data
    32/2512/2512 mbuf clusters in use (current/peak/max)
    5984 Kbytes allocated to network (79% of mb_map in use)
    17044 requests for memory denied
    828 requests for memory delayed
    0 calls to protocol drain routines

    將會滿屏都是

    從上面可以看出,All mbuf clusters exhausted,查原因得知,由于缺省的kern.ipc.nmbclusters比較小,以致于某些東東需要分配時得不到。延時828個。

    俺查到:kern.ipc.nmbclusters可以調整用來增加系統愿意申請的網絡mbuf的數量。每個cluster(簇)大概2K的內存,所以值1024代表保留2M內核內存作為網絡緩沖區。 你可以簡單的計算出需要多少。如果你有一個web服務器最多可以有1000個并發連接,每個連接吃掉16K接收和發送緩沖區,你大概需要32MB的網絡緩沖區來對付它。一個比較粗糙的方法是乘以2,所以32MBx2 = 64MB/2K = 32768。所以這個情況下你將需要設置nmbclusters到32768。我們建議為那些內存不多的機器設置1024到4096而4096到32768為那些有很多內存的機器。無論如何如何你不能設置一個很隨意的值,這可能導致啟動時崩潰。netstat(1)的-m選項可以用來查看網絡緩沖區的使用情況。老的FreeBSD系統沒有這個sysctl,所以需要設置內核配置選項NMBCLUSTERS。

    于上/boot/defaults/load.conf文件中增加了kern.ipc.nmbclusters="16384" ,重啟可解決。因為俺是郵件服務器兼DNS,沒必要整那么大。

    另外,在/sys/i386/conf/的LINT文件中有這樣一段:

    options         NBUF=512

    # Set the size of the mbuf KVM reservation, in clusters.  This is scaled
    # by approximately 2048 bytes.  The system will auto-size the mbuf area
    # to (512 + maxusers*16) if this option is not specified.
    # maxusers is in turn computed at boot time depending on available memory
    # or set to the value specified by "options MAXUSERS=x" (x=0 means
    # autoscaling).
    # So, to take advantage of autoscaling, you have to remove both
    # NMBCLUSTERS and MAXUSERS (and NMBUFS) from your kernel config.
    #
    options         NMBCLUSTERS=1024

    # Set the number of mbufs available in the system. Each mbuf
    # consumes 256 bytes. The system will autosize this (to 4 times
    # the number of NMBCLUSTERS, depending on other constraints)
    # if this option is not specified.

    傳說改這個也是有效的。

    原文轉自:http://www.kjueaiud.com

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