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SubjectRe: [PATCH] phonet: Check input from user before allocating
On 04/02/2012 08:14 PM, Eric Dumazet wrote:
> It seems netperf has some problems zith AF_UNIX dgram :
>
> socket(PF_FILE, SOCK_DGRAM, 0) = 4
> setsockopt(4, SOL_SOCKET, SO_SNDBUF, [0], 4) = 0
> getsockopt(4, SOL_SOCKET, SO_SNDBUF, [2048], [4]) = 0
> setsockopt(4, SOL_SOCKET, SO_RCVBUF, [0], 4) = 0
> getsockopt(4, SOL_SOCKET, SO_RCVBUF, [2288], [4]) = 0
> sendto(3, "\0\0\0+\377\377\377\377\0\0\0\0\0\0\10\0\0\0\0\10\0\0\0\0\0\0\0\0\0\0\0\0"..., 256, 0, NULL, 0) = 256
> select(1024, [3], NULL, NULL, {120, 0}) = 1 (in [3], left {119, 979635})
> recvfrom(3, "\0\0\0,\0\0\0\0\0\0\10\360\0\0\10\0\0\0\0\0\0\0\0\n\0\0\0\0\0\0\0\0"..., 256, 0, NULL, NULL) = 256
> connect(4, {sa_family=AF_FILE, path="/tmp/netpe62HGNM"}, 110) = 0
> rt_sigaction(SIGALRM, {0x403171, [ALRM], SA_RESTORER|SA_INTERRUPT, 0x7f691f026af0}, NULL, 8) = 0
> alarm(10) = 0
> sendto(4, "netperf\0netperf\0netperf\0netperf\0"..., 2048, 0, NULL, 0) = -1 EMSGSIZE (Message too long)
> dup(2) = 5
> fcntl(5, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE)
> fstat(5, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 3), ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f691fa18000
> lseek(5, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
> write(5, "dg_send: data send error: Messag"..., 43dg_send: data send error: Message too long
> ) = 43
> close(5) = 0
> munmap(0x7f691fa18000, 4096) = 0
> exit_group(1) = ?
>
> I guess the SO_SNDBUF/SO_RCVBUF limits are a bit too low ?

The AF_UNIX support in netperf is from a time when the code was very
simplistic - if no socket buffer size specified on the command line,
take the system default. If no send size specified, use the SO_SNDBUF
size, though some limits were applied.

Of course, along the way, there was a change in the value for socket
buffer size that meant "take the default" - it used to be 0 but then
became -1. Something to do with when Windows would decide to do copy
avoidance - tell Windows the socket buffer size is 0 and it will do copy
avoidance. The code in src/nettest_unix.c was still initializing to 0
rather than -1.

I've fixed that in the top-of-trunk:

raj@tardy:~/netperf2_trunk$ src/netperf -t DG_STREAM
DG UNIDIRECTIONAL SEND TEST
Socket Message Elapsed Messages
Size Size Time Okay Errors Throughput
bytes bytes secs # # 10^6bits/sec

126976 65507 10.00 1195647 0 811.07
2288 10.00 1195647 811.07

BTW, the local CPU utilization seems sane, but "remote" (which is
redundant anyway) seems to be fubar somehow. More bitrot I suspect.

happy benchmarking,

rick jones


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