Eric Dumazet 24adbc1676 tcp: fix SO_RCVLOWAT hangs with fat skbs ... We autotune rcvbuf whenever SO_RCVLOWAT is set to account for 100% overhead in tcp_set_rcvlowat() This works well when skb->len/skb->truesize ratio is bigger than 0.5 But if we receive packets with small MSS, we can end up in a situation where not enough bytes are available in the receive queue to satisfy RCVLOWAT setting. As our sk_rcvbuf limit is hit, we send zero windows in ACK packets, preventing remote peer from sending more data. Even autotuning does not help, because it only triggers at the time user process drains the queue. If no EPOLLIN is generated, this can not happen. Note poll() has a similar issue, after commit c7004482e8 ("tcp: Respect SO_RCVLOWAT in tcp_poll().") Fixes: 03f45c883c ("tcp: avoid extra wakeups for SO_RCVLOWAT users") Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2020-05-12 12:49:47 -07:00
..
acpi	Additional ACPI updates for 5.7-rc1	2020-04-06 10:35:06 -07:00
asm-generic	arch: split MODULE_ARCH_VERMAGIC definitions out to <asm/vermagic.h>	2020-04-23 10:50:26 +09:00
clocksource	pwm: omap-dmtimer: Drop unused header file	2020-03-30 18:03:06 +02:00
crypto	crypto: curve25519 - do not pollute dispatcher based on assembler	2020-04-09 00:01:59 +09:00
drm	drm/bridge: analogix_dp: Split bind() into probe() and real bind()	2020-04-09 10:29:35 +02:00
dt-bindings	RISC-V Patches for the 5.7 Merge Window, Part 1	2020-04-09 10:51:30 -07:00
keys
kunit
kvm
linux	ptp: fix struct member comment for do_aux_work	2020-05-12 12:10:17 -07:00
math-emu
media
misc
net	tcp: fix SO_RCVLOWAT hangs with fat skbs	2020-05-12 12:49:47 -07:00
pcmcia
ras
rdma
scsi	SCSI misc on 20200402	2020-04-02 17:03:53 -07:00
soc	net: dsa: ocelot: the MAC table on Felix is twice as large	2020-05-06 17:15:24 -07:00
sound	ASoC: Fixes for v5.7	2020-04-21 21:41:36 +02:00
target
trace	NFS client bugfixes for Linux 5.7	2020-05-02 11:24:01 -07:00
uapi	uapi: revert flexible-array conversions	2020-05-04 11:30:15 -05:00
vdso	vdso/datapage: Use correct clock mode name in comment	2020-04-20 19:19:52 +02:00
video
xen	xen: Use evtchn_type_t as a type for event channels	2020-04-07 12:12:54 +02:00