Hi. On Fri, Jun 19, 2015 at 02:47:20PM +0200, Petter Adsen wrote: > On Fri, 19 Jun 2015 14:09:45 +0200 > basti <black.flederm...@arcor.de> wrote: > > > The Problem is not the speed of 3 MB/s it's the load of 12 and more. > > > > On 19.06.2015 14:03, Sven Hartge wrote: > > > basti <black.flederm...@arcor.de> wrote: > > > > > >> iotop show me a read speed around 3 MB/s, there is a Class 10 UHS card > > >> (10-15 MB/s read, 9-5 MB/s write I guess). > > > More than 3MByte/s is not really achievable with a Pi-1, because the CPU > > > is very weak and the Ethernet-Chip is attached via USB. > > > > > > Under the best conditions you may be able to transfer up to 45MBit/s, > > > but a maximum transfer rate of about 35MBit/s is normal. > > The load is so high because USB is very CPU-intensive. If you were to > use the on-board Ethernet, you would not see such a high load.
What? Are you serious? I have this Nokia N900 lying behind me which is connected by IP-via-USB (aka usbnet aka g_ether) and with the order of magnitude slower ARM CPU it reliably shows 40mbps with no noticeable load. There are countless things I'd blame in this situation (large amounts of sync I/O from knfsd, relatively small amount of memory for a NFS server, HUEG read/write latency of MMC card), but blaming the type of Ethernet connection is the last thing I'd do. Regardless, there's a way to see the cause of all this trouble. Relatively new, but demonstrative one: perf record --a perf report perf.data Reco -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20150619130248.gb20...@d1696.int.rdtex.ru
