[PATCH 7/8] [I/OAT] Add a sysctl for tuning the I/OAT offloaded I/O threshold
From: Chris Leech <hidden>
Date: 2006-03-03 21:40:47
Also in:
lkml
Subsystem:
networking [general], networking [tcp], proc sysctl, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Neal Cardwell, Kees Cook, Joel Granados, Linus Torvalds
Any socket recv of less than this ammount will not be offloaded Signed-off-by: Chris Leech <redacted> --- include/linux/sysctl.h | 1 + include/net/tcp.h | 1 + net/core/user_dma.c | 4 ++++ net/ipv4/sysctl_net_ipv4.c | 10 ++++++++++ 4 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index dfcf449..f532f1e 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h@@ -402,6 +402,7 @@ enum NET_IPV4_IPFRAG_MAX_DIST=112, NET_TCP_MTU_PROBING=113, NET_TCP_BASE_MSS=114, + NET_TCP_DMA_COPYBREAK=115, }; enum {
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 2fc7f05..0740f32 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h@@ -221,6 +221,7 @@ extern int sysctl_tcp_adv_win_scale; extern int sysctl_tcp_tw_reuse; extern int sysctl_tcp_frto; extern int sysctl_tcp_low_latency; +extern int sysctl_tcp_dma_copybreak; extern int sysctl_tcp_nometrics_save; extern int sysctl_tcp_moderate_rcvbuf; extern int sysctl_tcp_tso_win_divisor;
diff --git a/net/core/user_dma.c b/net/core/user_dma.c
index 1e1aae5..dd259f0 100644
--- a/net/core/user_dma.c
+++ b/net/core/user_dma.c@@ -33,6 +33,10 @@ file called LICENSE. #ifdef CONFIG_NET_DMA +#define NET_DMA_DEFAULT_COPYBREAK 1024 + +int sysctl_tcp_dma_copybreak = NET_DMA_DEFAULT_COPYBREAK; + /** * dma_skb_copy_datagram_iovec - Copy a datagram to an iovec. * @skb - buffer to copy
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index ebf2e0b..f7bd9c2 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c@@ -680,6 +680,16 @@ ctl_table ipv4_table[] = { .mode = 0644, .proc_handler = &proc_dointvec, }, +#ifdef CONFIG_NET_DMA + { + .ctl_name = NET_TCP_DMA_COPYBREAK, + .procname = "tcp_dma_copybreak", + .data = &sysctl_tcp_dma_copybreak, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec + }, +#endif { .ctl_name = 0 } };