Hi, I'm trying to use the splice/vmsplice system calls to improve the samba server write throughput, but before touching the smbd, I started to improve the ttcp tool since it simple and has the same flow. I'm expecting to avoid the "copy_from_user" path when using those syscalls. so far, I couldn't make any improvement, actually the throughput get worst. the new receive flow looks like this (code also attached): 1. read tcp packet (64 pages) to page aligned buffer. 2. vmsplice the buffer to pipe with SPLICE_F_MOVE. 3. splice the pipe to the file, also with SPLICE_F_MOVE.
the strace shows that the splice takes a lot of time. also when profiling the kernel, I found that the memcpy() called to often !! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/