This is a note to let you know that I've just added the patch titled
ipvs: increase ip_vs_conn_tab_bits range for 64BIT
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ipvs-increase-ip_vs_conn_tab_bits-range-for-64bit.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 04292c695f82b6cf0d25dd5ae494f16ddbb621f6 Mon Sep 17 00:00:00 2001
From: Abhijeet Rastogi <abhijeet.1989@xxxxxxxxx>
Date: Tue, 16 May 2023 20:08:49 -0700
Subject: ipvs: increase ip_vs_conn_tab_bits range for 64BIT
From: Abhijeet Rastogi <abhijeet.1989@xxxxxxxxx>
commit 04292c695f82b6cf0d25dd5ae494f16ddbb621f6 upstream.
Current range [8, 20] is set purely due to historical reasons
because at the time, ~1M (2^20) was considered sufficient.
With this change, 27 is the upper limit for 64-bit, 20 otherwise.
Previous change regarding this limit is here.
Link: https://lore.kernel.org/all/86eabeb9dd62aebf1e2533926fdd13fed48bab1f.1631289960.git.aclaudi@xxxxxxxxxx/T/#u
Signed-off-by: Abhijeet Rastogi <abhijeet.1989@xxxxxxxxx>
Acked-by: Julian Anastasov <ja@xxxxxx>
Acked-by: Simon Horman <horms@xxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Cc: Allen Pais <apais@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/netfilter/ipvs/Kconfig | 27 ++++++++++++++-------------
net/netfilter/ipvs/ip_vs_conn.c | 4 ++--
2 files changed, 16 insertions(+), 15 deletions(-)
--- a/net/netfilter/ipvs/Kconfig
+++ b/net/netfilter/ipvs/Kconfig
@@ -44,7 +44,8 @@ config IP_VS_DEBUG
config IP_VS_TAB_BITS
int "IPVS connection table size (the Nth power of 2)"
- range 8 20
+ range 8 20 if !64BIT
+ range 8 27 if 64BIT
default 12
help
The IPVS connection hash table uses the chaining scheme to handle
@@ -54,24 +55,24 @@ config IP_VS_TAB_BITS
Note the table size must be power of 2. The table size will be the
value of 2 to the your input number power. The number to choose is
- from 8 to 20, the default number is 12, which means the table size
- is 4096. Don't input the number too small, otherwise you will lose
- performance on it. You can adapt the table size yourself, according
- to your virtual server application. It is good to set the table size
- not far less than the number of connections per second multiplying
- average lasting time of connection in the table. For example, your
- virtual server gets 200 connections per second, the connection lasts
- for 200 seconds in average in the connection table, the table size
- should be not far less than 200x200, it is good to set the table
- size 32768 (2**15).
+ from 8 to 27 for 64BIT(20 otherwise), the default number is 12,
+ which means the table size is 4096. Don't input the number too
+ small, otherwise you will lose performance on it. You can adapt the
+ table size yourself, according to your virtual server application.
+ It is good to set the table size not far less than the number of
+ connections per second multiplying average lasting time of
+ connection in the table. For example, your virtual server gets 200
+ connections per second, the connection lasts for 200 seconds in
+ average in the connection table, the table size should be not far
+ less than 200x200, it is good to set the table size 32768 (2**15).
Another note that each connection occupies 128 bytes effectively and
each hash entry uses 8 bytes, so you can estimate how much memory is
needed for your box.
You can overwrite this number setting conn_tab_bits module parameter
- or by appending ip_vs.conn_tab_bits=? to the kernel command line
- if IP VS was compiled built-in.
+ or by appending ip_vs.conn_tab_bits=? to the kernel command line if
+ IP VS was compiled built-in.
comment "IPVS transport protocol load balancing support"
--- a/net/netfilter/ipvs/ip_vs_conn.c
+++ b/net/netfilter/ipvs/ip_vs_conn.c
@@ -1485,8 +1485,8 @@ int __init ip_vs_conn_init(void)
int idx;
/* Compute size and mask */
- if (ip_vs_conn_tab_bits < 8 || ip_vs_conn_tab_bits > 20) {
- pr_info("conn_tab_bits not in [8, 20]. Using default value\n");
+ if (ip_vs_conn_tab_bits < 8 || ip_vs_conn_tab_bits > 27) {
+ pr_info("conn_tab_bits not in [8, 27]. Using default value\n");
ip_vs_conn_tab_bits = CONFIG_IP_VS_TAB_BITS;
}
ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits;
Patches currently in stable-queue which might be from abhijeet.1989@xxxxxxxxx are
queue-6.4/ipvs-increase-ip_vs_conn_tab_bits-range-for-64bit.patch
