Arjun Roy 5f7aadf03f net-zerocopy: Copy straggler unaligned data for TCP Rx. zerocopy. ... [ Upstream commit 18fb76ed53 ] When TCP receive zerocopy does not successfully map the entire requested space, it outputs a 'hint' that the caller should recvmsg(). Augment zerocopy to accept a user buffer that it tries to copy this hint into - if it is possible to copy the entire hint, it will do so. This elides a recvmsg() call for received traffic that isn't exactly page-aligned in size. This was tested with RPC-style traffic of arbitrary sizes. Normally, each received message required at least one getsockopt() call, and one recvmsg() call for the remaining unaligned data. With this change, almost all of the recvmsg() calls are eliminated, leading to a savings of about 25%-50% in number of system calls for RPC-style workloads. Signed-off-by: Arjun Roy <arjunroy@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-11-26 10:39:14 +01:00
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asm-generic	mm/madvise: introduce process_madvise() syscall: an external memory hinting API	2020-10-18 09:27:10 -07:00
drm	drm/fourcc: fix Amlogic format modifier masks	2021-03-04 11:37:38 +01:00
linux	net-zerocopy: Copy straggler unaligned data for TCP Rx. zerocopy.	2021-11-26 10:39:14 +01:00
misc	habanalabs: Add an option to map CB to device MMU	2020-09-22 18:49:54 +03:00
mtd	MTD: mtd-abi.h: drop a duplicated word	2020-08-02 23:00:10 +02:00
rdma	RDMA/vmw_pvrdma: Fix network_hdr_type reported in WC	2021-01-30 13:55:18 +01:00
scsi	scsi: qla2xxx: Change in PUREX to handle FPIN ELS requests	2020-07-01 22:24:16 -04:00
sound	ALSA: fix kernel-doc markups	2020-10-26 15:26:31 +01:00
video
xen	xen/gntdev: gntdev.h: drop a duplicated word	2020-08-03 07:46:42 +02:00
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