Dear Stephen, Thankx for the quick reply.... On Dec 6, 2007 10:40 AM, Stephen Hemminger <shemminger@xxxxxxxxxxxxxxxxxxxx> wrote: >>On Wed, 5 Dec 2007 23:58:59 +0530 "Tharindu Rukshan Bamunuarachchi" <tharindunix@xxxxxxxxx> wrote: >> >> Dear All, >> >> How can I maintain constant/minimum socket receive buffer. >> >> I have used setsockopt() with SO_RCVBUF value for 256bytes >> >> >> >Why? Is your application limited? or is the network so busted it can't >take outstanding data? - We are trying to throttle 'sender application' by not reading from TCP stack (from receiver side) after reading certain number of messages. - Here we wanted to limit number of data buffered in the receiver side when receiver application stops reading from TCP stack. >Setting RCVBUF less than MTU size is likely to be ignored, otherwise >the sender on the other >size would be do silly window avoidance. - we set SO_RCVBUF value to 512 bytes before listen, then TCP negotiated 768 bytes while establishing a connection. We stopped reading from TCP stack after some time and we observed that TCP advertising window size reduced to 0. Subsequently receiver advertised higher values such as 1152, 2304, 1460. - Does this mean that receive buffer size has grown beyond initially set value (512 bytes)? 11:48:46.887136 IP v20z-10.28902 > 172.25.41.159.2963: S 1720573913:1720573913(0) ack 253836197 win 768 <mss 1460,nop,nop,sackOK> 11:48:46.894547 IP v20z-10.28902 > 172.25.41.159.2963: . ack 113 win 656 11:48:46.897735 IP v20z-10.28902 > 172.25.41.159.2963: P 1:92(91) ack 113 win 656 11:48:47.295885 IP v20z-10.28902 > 172.25.41.159.2963: . 144498:145958(1460) ack 3321 win 11 11:48:47.328583 IP v20z-10.28902 > 172.25.41.159.2963: . ack 3321 win 1152 11:48:47.329513 IP v20z-10.28902 > 172.25.41.159.2963: . ack 4473 win 0 11:48:47.331274 IP v20z-10.28902 > 172.25.41.159.2963: . ack 4473 win 1152 11:48:47.332186 IP v20z-10.28902 > 172.25.41.159.2963: . ack 5625 win 1152 11:48:47.333379 IP v20z-10.28902 > 172.25.41.159.2963: . ack 6777 win 2304 11:48:47.374390 IP v20z-10.28902 > 172.25.41.159.2963: . ack 8237 win 1460 Thankx Regards Tharindu -- Tharindu Rukshan Bamunuarachchi asmlinkage void __init start_kernel(void) - To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
