Hi, we're using USB RAW gadget for communicating with PC application. We have created loopback test which send file (any size) from PC to device and then same data are sent back to PC to verify roundtrip time (using bulk data transfer). Everything works fine up to 3MB file size. If we sent bigger file like e.g. 5M we can receive file on device but when we want to write to output endpoint we got: WARNING: CPU: 0 PID: 12299 at /kernel-source//mm/page_alloc.c:3725 __alloc_pages_nodemask+0x1b0/0xde4 [<c010fa08>] (unwind_backtrace) from [<c010c45c>] (show_stack+0x20/0x24) [<c010c45c>] (show_stack) from [<c04cc0d4>] (dump_stack+0x20/0x28) [<c04cc0d4>] (dump_stack) from [<c01324ac>] (__warn+0xec/0x108) [<c01324ac>] (__warn) from [<c0132598>] (warn_slowpath_null+0x30/0x38) [<c0132598>] (warn_slowpath_null) from [<c021ccb8>] (__alloc_pages_nodemask+0x1b0/0xde4) [<c021ccb8>] (__alloc_pages_nodemask) from [<c023b888>] (kmalloc_order+0x2c/0x48) [<c023b888>] (kmalloc_order) from [<c023b8d0>] (kmalloc_order_trace+0x2c/0xd4) [<c023b8d0>] (kmalloc_order_trace) from [<c0261c24>] (__kmalloc+0x40/0x264) [<c0261c24>] (__kmalloc) from [<bf039bc4>] (ffs_epfile_io+0x13c/0x570 [usb_f_fs]) [<bf039bc4>] (ffs_epfile_io [usb_f_fs]) from [<bf03a0c0>] (ffs_epfile_write_iter+0xc8/0x120 [usb_f_fs]) [<bf03a0c0>] (ffs_epfile_write_iter [usb_f_fs]) from [<c02734bc>] (new_sync_write+0xc8/0xec) [<c02734bc>] (new_sync_write) from [<c027351c>] (__vfs_write+0x3c/0x48) [<c027351c>] (__vfs_write) from [<c02749a0>] (vfs_write+0xcc/0x158) [<c02749a0>] (vfs_write) from [<c02756ac>] (SyS_write+0x50/0x88) [<c02756ac>] (SyS_write) from [<c0107a20>] (ret_fast_syscall+0x0/0x54) ---[ end trace fe5f79fe415b9881 ]--- and write ends up with: write /run/ffs/ep1: cannot allocate memory When checked free command there should be plenty of available memory. Is there some limitation when writing to endpoint? We tried to split buffer to e.g. 3M and sent it and this works but looks like there is penalty when sending bigger files (100MB file received in 5secs whicle sending back it took 2minutes). Thanks for ideas and hints. BR, marek -- as simple and primitive as possible ------------------------------------------------- Marek Belisko - OPEN-NANDRA Freelance Developer Ruska Nova Ves 219 | Presov, 08005 Slovak Republic Tel: +421 915 052 184 skype: marekwhite twitter: #opennandra web: http://open-nandra.com
