After some enhancements made for netchannel subsystem I'm pleased to
announce, that netchannel subsystem outperforms existing layered design
both in CPU usage and network speed.
Well, after such pretentious introduction I want to cool things down.
CPU usage is about 1-2% less for netchannels and network performance is
about 1-2 MB higher and sometimes exceeds 84 MB/sec which, I think,
is maximum for given network setup (e1000 receive, r8169 send, 1500 MTU).
It is stable and 100% reproductible result.
Performance graph and patch are attached.
Interesting note, that netchannel copy_to_user() setup slightly
outperforms memcpy() setup.
I have some doubts that stock socket TCP code was used in Van Jacobson
netchannel implementation, especially in the final benchmarks, because
of his words about userspace TCP processing, which sometimes pushes to read
RFC 793 and do some coding...
Previous patches, userspace utility, design and implementatin details
can be found at project's homepage [1].
1. Netchannel homepage.
http://tservice.net.ru/~s0mbre/old/?section=projects&item=netchannel
Signed-off-by: Evgeniy Polyakov <[EMAIL PROTECTED]>
diff --git a/arch/i386/kernel/syscall_table.S b/arch/i386/kernel/syscall_table.S
index f48bef1..7a4a758 100644
--- a/arch/i386/kernel/syscall_table.S
+++ b/arch/i386/kernel/syscall_table.S
@@ -315,3 +315,5 @@ ENTRY(sys_call_table)
.long sys_splice
.long sys_sync_file_range
.long sys_tee /* 315 */
+ .long sys_vmsplice
+ .long sys_netchannel_control
diff --git a/arch/x86_64/ia32/ia32entry.S b/arch/x86_64/ia32/ia32entry.S
index 5a92fed..fdfb997 100644
--- a/arch/x86_64/ia32/ia32entry.S
+++ b/arch/x86_64/ia32/ia32entry.S
@@ -696,4 +696,5 @@ ia32_sys_call_table:
.quad sys_sync_file_range
.quad sys_tee
.quad compat_sys_vmsplice
+ .quad sys_netchannel_control
ia32_syscall_end:
diff --git a/include/asm-i386/unistd.h b/include/asm-i386/unistd.h
index eb4b152..777cd85 100644
--- a/include/asm-i386/unistd.h
+++ b/include/asm-i386/unistd.h
@@ -322,8 +322,9 @@
#define __NR_sync_file_range 314
#define __NR_tee 315
#define __NR_vmsplice 316
+#define __NR_netchannel_control317
-#define NR_syscalls 317
+#define NR_syscalls 318
/*
* user-visible error numbers are in the range -1 - -128: see
diff --git a/include/asm-x86_64/unistd.h b/include/asm-x86_64/unistd.h
index feb77cb..08c230e 100644
--- a/include/asm-x86_64/unistd.h
+++ b/include/asm-x86_64/unistd.h
@@ -617,8 +617,10 @@ __SYSCALL(__NR_tee, sys_tee)
__SYSCALL(__NR_sync_file_range, sys_sync_file_range)
#define __NR_vmsplice 278
__SYSCALL(__NR_vmsplice, sys_vmsplice)
+#define __NR_netchannel_control279
+__SYSCALL(__NR_vmsplice, sys_netchannel_control)
-#define __NR_syscall_max __NR_vmsplice
+#define __NR_syscall_max __NR_netchannel_control
#ifndef __NO_STUBS
diff --git a/include/linux/netchannel.h b/include/linux/netchannel.h
new file mode 100644
index 000..ed426e6
--- /dev/null
+++ b/include/linux/netchannel.h
@@ -0,0 +1,118 @@
+/*
+ * netchannel.h
+ *
+ * 2006 Copyright (c) Evgeniy Polyakov <[EMAIL PROTECTED]>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef __NETCHANNEL_H
+#define __NETCHANNEL_H
+
+#include
+
+enum netchannel_commands {
+ NETCHANNEL_CREATE = 0,
+ NETCHANNEL_REMOVE,
+ NETCHANNEL_BIND,
+ NETCHANNEL_READ,
+ NETCHANNEL_DUMP,
+};
+
+enum netchannel_type {
+ NETCHANNEL_COPY_USER = 0,
+ NETCHANNEL_MMAP,
+ NETCHANEL_VM_HACK,
+};
+
+struct unetchannel
+{
+ __u32 src, dst; /* source/destination
hashes */
+ __u16 sport, dport; /* source/destination
ports */
+ __u8proto; /* IP protocol number */
+ __u8type; /* Netchannel type */
+ __u8memory_limit_order; /* Memor limit order */
+ __u8init_stat_work; /* Start statistic
dumping */
+};
+
+struct unetchannel_control
+{
+ struct unetchannel unc;
+ __u32 cmd;
+ __u32 len;
