after IO delay is adjusted, the FTP upload speed is up to 600k byte/s. the FTP download speed is up to 300k byte/s
The download will cause TCP ZERO windows information happen. I am not clear about it. If this happen, the download speed will lost heavily. I attached my download Trace.pcap. ################# parts of lwipopt.h############# /* Controls if TCP should queue segments that arrive out of order. Define to 0 if your device is low on memory. */ #define TCP_QUEUE_OOSEQ 0 /* TCP Maximum segment size. */ #define TCP_MSS 1460 /* TCP sender buffer space (bytes). */ #define TCP_SND_BUF (TCP_MSS*4) /* TCP sender buffer space (pbufs). This must be at least = 2 * TCP_SND_BUF/TCP_MSS for things to work. */ #define TCP_SND_QUEUELEN (4 * TCP_SND_BUF/TCP_MSS) /* TCP writable space (bytes). This must be less than or equal to TCP_SND_BUF. It is the amount of space which must be available in the tcp snd_buf for select to return writable */ #define TCP_SNDLOWAT (TCP_SND_BUF/2) /* TCP receive window. */ #define TCP_WND (TCP_MSS * 4) /* Maximum number of retransmissions of data segments. */ #define TCP_MAXRTX 8 /* Maximum number of retransmissions of SYN segments. */ #define TCP_SYNMAXRTX 8 ################# ############# my pool ########### LWIP_MALLOC_MEMPOOL(64, 64) LWIP_MALLOC_MEMPOOL(16, 128) LWIP_MALLOC_MEMPOOL(8, 1104) LWIP_MALLOC_MEMPOOL(20, 1536) ############################### Is there configuration problem in my setup? Why my download is only half of my upload? Lee On Thu, Feb 4, 2010 at 10:56 PM, Kieran Mansley <[email protected]> wrote: > On Thu, 2010-02-04 at 09:40 -0500, Bill Auerbach wrote: > > Maybe I’m wrong, but MBS is MegaBytes/Sec and MbS is MegaBits/Sec. > > KBS is KiloBytes/Sec and KbS is KiloBits/Sec. > > I'd stick a "/" or a "p" in there too: > > Mbps = Mb/s = Mega bits per second > MBps = MB/s = Mega bytes per second > and so on. > > > > So you want 200KBS which is about 1600KbS, which is 1.6MbS. If I’ve > > got the math and numbers right here, then 200KBS this should not be a > > problem at all. > > That's the performance he's getting, he wants to know if that is good or > bad and so whether he should spend time making it better. > > Kieran > > > > _______________________________________________ > lwip-users mailing list > [email protected] > http://lists.nongnu.org/mailman/listinfo/lwip-users >
downloadTrace.pcap
Description: Binary data
_______________________________________________ lwip-users mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/lwip-users
