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Hi Julian Anastasov,
>Can you keep the previous line width of the above help
because on standard 80-width window the help now gets truncated in
make menuconfig.
Refer this screenshot: https://i.imgur.com/9LgttpC.png
Sorry for the confusion, I was already expecting this comment. The
patch had a few words added, hence it feels like many lines have
changed. However, no line actually exceeds 80 width.
Longest line is still 80-width max. Do you prefer I reduce it to a
lower number like 70?
Thanks,
Abhijeet
On Mon, May 15, 2023 at 8:18 AM Julian Anastasov <ja@xxxxxx> wrote:
>
>
> Hello,
>
> On Sun, 14 May 2023, Abhijeet Rastogi wrote:
>
> > 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>
> > ---
> > The conversation for this started at:
> >
> > https://www.spinics.net/lists/netfilter/msg60995.html
> >
> > The upper limit for algo is any bit size less than 32, so this
> > change will allow us to set bit size > 20. Today, it is common to have
> > RAM available to handle greater than 2^20 connections per-host.
> >
> > Distros like RHEL already allow setting limits higher than 20.
> > ---
> > Changes in v2:
> > - Lower the ranges, 27 for 64bit, 20 otherwise
> > - Link to v1:
> > https://lore.kernel.org/r/20230412-increase_ipvs_conn_tab_bits-v1-1-60a4f9f4c8f2@xxxxxxxxx
> > ---
> > net/netfilter/ipvs/Kconfig | 26 +++++++++++++-------------
> > net/netfilter/ipvs/ip_vs_conn.c | 4 ++--
> > 2 files changed, 15 insertions(+), 15 deletions(-)
> >
> > diff --git a/net/netfilter/ipvs/Kconfig b/net/netfilter/ipvs/Kconfig
> > index 271da8447b29..aac5d6bd82e6 100644
> > --- 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
> > @@ -52,18 +53,17 @@ config IP_VS_TAB_BITS
> > reduce conflicts when there are hundreds of thousands of connections
> > in the hash table.
> >
> > - 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).
> > + 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 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).
>
> Can you keep the previous line width of the above help
> because on standard 80-width window the help now gets truncated in
> make menuconfig.
>
> After that I'll send a patch on top of yours to limit the
> rows depending on the memory.
>
> > Another note that each connection occupies 128 bytes effectively and
> > each hash entry uses 8 bytes, so you can estimate how much memory is
> > diff --git a/net/netfilter/ipvs/ip_vs_conn.c
> > b/net/netfilter/ipvs/ip_vs_conn.c
> > index 13534e02346c..e1b9b52909a5 100644
> > --- a/net/netfilter/ipvs/ip_vs_conn.c
> > +++ b/net/netfilter/ipvs/ip_vs_conn.c
> > @@ -1484,8 +1484,8 @@ 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;
> >
> > ---
>
> Regards
>
> --
> Julian Anastasov <ja@xxxxxx>
>
--
Cheers,
Abhijeet (https://abhi.host)
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