Re: bad performance on irix

nbuf is set to 6653, here is a excerpt from par, thanks and regards

0.000mS(+ 0uS)[ 6] postgres(54373): END-semctl() = 0
0.038mS(+ 37uS)[ 6] postgres(54373): semop(606, 0x7fff1b50, 1)
OK
20.122mS(+20084uS)[ 6] postgres(54373): semop(606, 0x7fff1b10, 1)
27.747mS(+ 7624uS)[ 6] postgres(54373): END-semop() OK
27.772mS(+ 24uS)[ 6] postgres(54373): semop(606, 0x7fff1b50, 1)
OK
30.772mS(+ 3000uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
35.681mS(+ 4908uS)[ 6] postgres(54373): END-semop() OK
35.703mS(+ 21uS)[ 6] postgres(54373): semop(606, 0x7fff1a00, 1)
OK
40.219mS(+ 4516uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
58.859mS(+18640uS)[ 6] postgres(54373): END-semop() OK
58.882mS(+ 23uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
61.475mS(+ 2592uS)[ 6] postgres(54373): END-semop() OK
61.495mS(+ 20uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
61.967mS(+ 471uS)[ 6] postgres(54373): semop(606, 0x7fff1a00, 1)
OK
62.839mS(+ 871uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
63.063mS(+ 224uS)[ 6] postgres(54373): semop(606, 0x7fff1a00, 1)
OK
65.175mS(+ 2112uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
83.060mS(+17884uS)[ 6] postgres(54373): END-semop() OK
83.083mS(+ 22uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
85.848mS(+ 2764uS)[ 6] postgres(54373): END-semop() OK
85.869mS(+ 21uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
87.775mS(+ 1906uS)[ 6] postgres(54373): semop(606, 0x7fff1a00, 1)
OK
87.898mS(+ 122uS)[ 6] postgres(54373): semop(606, 0x7fff1b10, 1)
OK
89.822mS(+ 1924uS)[ 6] postgres(54373): semop(606, 0x7fff1b50, 1)
OK
91.676mS(+ 1853uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
100.127mS(+ 8450uS)[ 6] postgres(54373): END-semop() OK
100.152mS(+ 25uS)[ 6] postgres(54373): semop(606, 0x7fff1a00, 1)
OK
110.706mS(+10553uS)[ 6] postgres(54373): semop(606, 0x7fff1b10, 1)
OK
111.109mS(+ 403uS)[ 6] postgres(54373): semop(606, 0x7fff1b50, 1)
OK
112.860mS(+ 1750uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
113.292mS(+ 432uS)[ 6] postgres(54373): semop(606, 0x7fff1a00, 1)
OK
118.938mS(+ 5646uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
119.440mS(+ 502uS)[ 6] postgres(54373): semop(606, 0x7fff1a00, 1)
OK
120.410mS(+ 969uS)[ 6] postgres(54373): semop(606, 0x7fff1a00, 1)
OK
120.553mS(+ 142uS)[ 6] postgres(54373): semop(606, 0x7fff1b50, 1)
OK
126.386mS(+ 5833uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
126.919mS(+ 533uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
127.574mS(+ 654uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
128.011mS(+ 436uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
128.489mS(+ 477uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
128.895mS(+ 405uS)[ 6] postgres(54373): semop(606, 0x7fff1a00, 1)
OK
128.990mS(+ 95uS)[ 6] postgres(54373): semop(606, 0x7fff1b50, 1)
OK
149.407mS(+20416uS)[ 6] postgres(54373): semop(606, 0x7fff1b10, 1)
OK
149.969mS(+ 561uS)[ 6] postgres(54373): semop(606, 0x7fff1b10, 1)
OK
150.364mS(+ 395uS)[ 6] postgres(54373): semop(606, 0x7fff1b50, 1)
OK
151.462mS(+ 1097uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
156.185mS(+ 4723uS)[ 6] postgres(54373): END-semop() OK
156.204mS(+ 18uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
156.876mS(+ 671uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
158.145mS(+ 1269uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
158.873mS(+ 728uS)[ 6] postgres(54373): semop(606, 0x7fff1a00, 1)
OK
159.773mS(+ 899uS)[ 6] postgres(54373): semop(606, 0x7fff1a10, 1)
OK
160.309mS(+ 535uS)[ 6] postgres(54373): semop(606, 0x7fff1a00, 1)
OK