Robin Getz wrote: > On Sat 8 Aug 2009 05:50, Ben Warren pondered: > >> Allesandro, >> >> Alessandro Rubini wrote: >> >>> I finally fixed the defrag code, testing with NFS as well. >>> Didn't take performance figures, tough, for lack of time. >>> > > Checking out performance with tftp - server is Linux 2.6.27 located in > Germany, client (U-Boot running net/next) is located in the USA. Packets > fragmented, and arriving out of order. > > U-Boot image (214268 bytes) > > tftpblocksize download rate > (bytes) (ms) (bytes/second) > 512 48,246 4,441 > 1024 24,482 8,752 > 1468 ( 1MTU) 17,243 12,426 > 2048 12,517 17,118 > 2948 ( 2MTU) 8,912 24,042 > 4428 ( 3MTU) 6,167 34,744 > 4096 6,608 32,425 > 5908 ( 4MTU) 4,840 44,270 > 7388 ( 5MTU) 4,042 53,010 > 8192 3,641 58,848 > 8868 ( 6MTU) 3,425 62,560 > 10348 ( 7MTU) 2,974 72,047 > 11828 ( 8MTU) 2,736 78,314 > 13308 ( 9MTU) 2,508 85,433 > 14788 (10MTU) 2,281 93,935 > 16000 2,233 95,955 > 16268 (11MTU) 2,174 98,559 > > So, that is 17-seconds (default - on the master), to 2 seconds. Wow - a 87% > reduction! > > Wicked cool. > Doing the same with a larger image (default kernel + ext2 file system == > 12Meg), gets similar results - goes from 928,688 ms / 12,493 bytes/second > (yeah, that is 15 minutes with a tftpblocksize == 1468) to 107,626 ms / > 107,866 bytes/second (that is under two minutes with a tftpblocksize == > 16000)... Again - an 88% reduction in time spent waiting... > > So - I think this is well worth the effort for those people who want to use > tftp outside of a local network. (on a local network - things do not change > that drastically - An 18Meg file with default tftpblocksize (1468 bytes) took > 5084ms to download, and with a tftpblocksize of 16268, it about half the > time - 2625 ms... > > Thanks to Alessandro for putting it together. > > Feel free to add my Signed-off (once the docs have been updated explaining > what this is all for). > > I'll do that. Thanks for all your help. > -Robin >
regards, Ben _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
