Francis Yan 1c885808e4 tcp: SOF_TIMESTAMPING_OPT_STATS option for SO_TIMESTAMPING ... This patch exports the sender chronograph stats via the socket SO_TIMESTAMPING channel. Currently we can instrument how long a particular application unit of data was queued in TCP by tracking SOF_TIMESTAMPING_TX_SOFTWARE and SOF_TIMESTAMPING_TX_SCHED. Having these sender chronograph stats exported simultaneously along with these timestamps allow further breaking down the various sender limitation. For example, a video server can tell if a particular chunk of video on a connection takes a long time to deliver because TCP was experiencing small receive window. It is not possible to tell before this patch without packet traces. To prepare these stats, the user needs to set SOF_TIMESTAMPING_OPT_STATS and SOF_TIMESTAMPING_OPT_TSONLY flags while requesting other SOF_TIMESTAMPING TX timestamps. When the timestamps are available in the error queue, the stats are returned in a separate control message of type SCM_TIMESTAMPING_OPT_STATS, in a list of TLVs (struct nlattr) of types: TCP_NLA_BUSY_TIME, TCP_NLA_RWND_LIMITED, TCP_NLA_SNDBUF_LIMITED. Unit is microsecond. Signed-off-by: Francis Yan <francisyyan@gmail.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-11-30 10:04:25 -05:00
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auxvec.h	s390: Define AT_VECTOR_SIZE_ARCH for ARCH_DLINFO	2016-07-31 09:28:09 -04:00
bitsperlong.h
byteorder.h
chpid.h
chsc.h
clp.h	s390/pci: add ioctl interface for CLP	2016-03-07 16:54:32 +01:00
cmb.h
dasd.h	s390/dasd: Add new ioctl BIODASDCHECKFMT	2016-04-15 18:16:39 +02:00
debug.h
errno.h
fcntl.h
hypfs.h	s390/hypfs: Add diagnose 0c support	2015-02-10 16:38:58 +01:00
ioctl.h
ioctls.h
ipcbuf.h
Kbuild	s390: export header for CLP ioctl	2016-09-20 14:26:35 +02:00
kvm_para.h
kvm_perf.h
kvm_virtio.h
kvm.h	KVM: s390: vsie: add indication for future features	2016-06-21 09:43:47 +02:00
mman.h
monwriter.h
msgbuf.h
param.h
poll.h
posix_types.h
ptrace.h	s390/ptrace: clarify bits in the per_struct	2016-06-28 13:11:55 +02:00
qeth.h
resource.h
schid.h
sclp_ctl.h
sembuf.h
setup.h
shmbuf.h
sie.h	KVM: s390: Add sthyi emulation	2016-06-10 12:07:12 +02:00
sigcontext.h
siginfo.h
signal.h
socket.h	tcp: SOF_TIMESTAMPING_OPT_STATS option for SO_TIMESTAMPING	2016-11-30 10:04:25 -05:00
sockios.h
stat.h
statfs.h
swab.h
tape390.h
termbits.h
termios.h
types.h
ucontext.h
unistd.h	s390: wire up preadv2/pwritev2 syscalls	2016-04-01 08:42:38 +02:00
virtio-ccw.h
vtoc.h
zcrypt.h