What value of HZ are you using? If you're still at the 2.6 default of 1000, try reducing it to 100 and see if things improve... ----- Original Message ----- From: "kernel coder" <lhrkernelcoder@xxxxxxxxx> To: <linux-mips@xxxxxxxxxxxxxx> Sent: Saturday, January 07, 2006 8:02 AM Subject: Almost 80% of UDP packets dropped > hi, > I was trying to measure the UDP reception speed on my borad which > has MIPS 4kc processor with 133 MHZ speed.I was transfering 10mb file > from intel pentium 4 machine to MIPS board,but the recieved file was > only 900kB. > > When i further investigated the problem ,i came to know that the user > application was not getting enough opportunities to get data from > socket queue which caused almost 80% of packets to be dropped as > socket queue had no free space. > > When i increased the socket recieve buffer size,it resulted in > increase in no. of packets recieved .When i slow slowed down the > transmitter , it also caused more packets to be recieved. > > But the above mentioned mechanism only decreased no. of lost > packets.But there was no way that i could increase UDP reception speed > because the user application was not getting enough opportunities to > read packets in burst of UDP packets. > > I noticed that user application started recieveing packets after > Kernel had recieved all the UDP packets. > > Please tell me how can i make sure that user application or udp client > running MIPS 4kc processor gets enough opportunities to dequeue > packets from socket buffer so that lost of packets could be reduced to > minimal and also the size of UDP recieved file in a specific interval > of time could be increased. > > lhrkernelcoder > >
