Hello -
Thanks for chiming in. Named is PID 8349 in my case. Here's a snippet of
the output from strace:
[pid 8351] time( <unfinished ...>
[pid 8352] <... sendmsg resumed> ) = 56 <0.000104>
[pid 8352] recvmsg(515, {msg_name(16)={sa_family=AF_INET,
sin_port=htons(38385), sin_addr=inet_addr("205.188.158.143")},
msg_iov(1)=[{"Q&\0\0\0\1\0\0\0\0\0\1\003157\003161\00272\00264\7in-ad"...,
4096}], msg_controllen=20, {cmsg_len=20, cmsg_level=SOL_SOCKET,
cmsg_type=0x1d /* SCM_??? */, ...}, msg_flags=0}, 0) = 55 <0.000031>
[pid 8351] <... time resumed> NULL) = 1352668045 <0.000353>
[pid 8352] futex(0x9b6aecc, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 8351] stat64("/etc/localtime", {st_mode=S_IFREG|0644,
st_size=2819, ...}) = 0 <0.000109>
[pid 8351] stat64("/etc/localtime", {st_mode=S_IFREG|0644,
st_size=2819, ...}) = 0 <0.000086>
[pid 8351] stat64("/etc/localtime", {st_mode=S_IFREG|0644,
st_size=2819, ...}) = 0 <0.000084>
[pid 8351] send(3, "<30>Nov 11 13:07:25 named[8349]:"..., 107,
MSG_NOSIGNAL) = 107 <0.015232>
[pid 8351] futex(0x9b6aecc, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 8353] <... futex resumed> ) = 0 <0.052813>
[pid 8351] <... futex resumed> ) = 1 <0.000125>
[pid 8353] time(NULL) = 1352668045 <0.000020>
[pid 8353] stat64("/etc/localtime", {st_mode=S_IFREG|0644,
st_size=2819, ...}) = 0 <0.000025>
[pid 8353] stat64("/etc/localtime", {st_mode=S_IFREG|0644,
st_size=2819, ...}) = 0 <0.000022>
[pid 8351] sendmsg(513, {msg_name(16)={sa_family=AF_INET,
sin_port=htons(38162), sin_addr=inet_addr("205.188.158.207")},
msg_iov(1)=[{"@%\204\0\0\1\0\1\0\2\0\1\003249\00221\003140\003204\7in-a"...,
138}], msg_controllen=0, msg_flags=0}, 0 <unfinished ...>
[pid 8353] stat64("/etc/localtime", <unfinished ...>
[pid 8351] <... sendmsg resumed> ) = 138 <0.000048>
[pid 8353] <... stat64 resumed> {st_mode=S_IFREG|0644, st_size=2819,
...}) = 0 <0.000041>
[pid 8351] recvmsg(513, <unfinished ...>
[pid 8353] send(3, "<30>Nov 11 13:07:25 named[8349]:"..., 103,
MSG_NOSIGNAL <unfinished ...>
[pid 8351] <... recvmsg resumed> {msg_name(16)={sa_family=AF_INET,
sin_port=htons(53507), sin_addr=inet_addr("205.188.158.206")},
msg_iov(1)=[{"\244\273\0\0\0\1\0\0\0\0\0\1\003246\003161\00272\00264\7in-ad"...,
4096}], msg_controllen=20, {cmsg_len=20, cmsg_level=SOL_SOCKET,
cmsg_type=0x1d /* SCM_??? */, ...}, msg_flags=0}, 0) = 55 <0.000086>
[pid 8351] futex(0x9b6aecc, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 8353] <... send resumed> ) = 103 <0.015034>
[pid 8353] futex(0x9b6aecc, FUTEX_WAKE_PRIVATE, 1) = 1 <0.000025>
[pid 8350] <... futex resumed> ) = 0 <0.051772>
[pid 8350] time( <unfinished ...>
[pid 8353] sendmsg(513, {msg_name(16)={sa_family=AF_INET,
sin_port=htons(60702), sin_addr=inet_addr("64.12.139.17")},
msg_iov(1)=[{"\343F\204\0\0\1\0\1\0\2\0\1\003251\003160\00272\00264\7in-ad"...,
151}], msg_controllen=0, msg_flags=0}, 0 <unfinished ...>
[pid 8350] <... time resumed> NULL) = 1352668045 <0.000210>
[pid 8353] <... sendmsg resumed> ) = 151 <0.000084>
[pid 8350] stat64("/etc/localtime", <unfinished ...>
[pid 8353] recvmsg(513, <unfinished ...>
[pid 8350] <... stat64 resumed> {st_mode=S_IFREG|0644, st_size=2819,
...}) = 0 <0.000085>
[pid 8353] <... recvmsg resumed> {msg_name(16)={sa_family=AF_INET,
sin_port=htons(3794), sin_addr=inet_addr("64.12.139.19")},
msg_iov(1)=[{"|\354\0\0\0\1\0\0\0\0\0\1\00230\003160\00272\00264\7in-add"...,
4096}], msg_controllen=20, {cmsg_len=20, cmsg_level=SOL_SOCKET,
cmsg_type=0x1d /* SCM_??? */, ...}, msg_flags=0}, 0) = 54 <0.000150>
[pid 8350] stat64("/etc/localtime", <unfinished ...>
[pid 8353] futex(0x9b6aecc, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 8350] <... stat64 resumed> {st_mode=S_IFREG|0644, st_size=2819,
...}) = 0 <0.000076>
[pid 8350] stat64("/etc/localtime", {st_mode=S_IFREG|0644,
st_size=2819, ...}) = 0 <0.000029>
[pid 8350] send(3, "<30>Nov 11 13:07:25 named[8349]:"..., 102,
MSG_NOSIGNAL <unfinished ...>
On 11/11/2012 1:46 PM, Florian Weimer wrote:
* Ed LaFrance:
Running BIND 9.3.6-P1-RedHat-9.3.6-16.P1.el5 on a quadcore xeon server
(3Ghz) with 2GB RAM. Named is being used only for rDNS queries against
our address space.
You should really upgrade to the latest version on that branch (likely
bind-9.3.6-20.P1.el5_8.5).
The bottom line is: I need to improve named performance. Tcpdump only
shows about 20 requests per second on average, I would estimate. This
should be handled easily, but instead it's gagging on it and the
requests are stacking up.
Something is stalling the named process. Try to run "strace -T -f -p
4509" (4509 is the PID for the named process) and see where named
spends its time. The top output you quoted suggests that the process
is not spinning in user space.
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