* tcp_bind_bucket is missing from slabinfo
@ 2018-02-24 6:50 Stephen Hemminger
2018-02-24 14:35 ` Matthew Wilcox
0 siblings, 1 reply; 3+ messages in thread
From: Stephen Hemminger @ 2018-02-24 6:50 UTC (permalink / raw)
To: netdev, linux-mm
Somewhere back around 3.17 the kmem cache "tcp_bind_bucket" dropped out
of /proc/slabinfo. It turns out the ss command was dumpster diving
in slabinfo to determine the number of bound sockets and now it always
reports 0.
Not sure why, the cache is still created but it doesn't
show in slabinfo. Could it be some part of making slab/slub common code
(or network namespaces). The cache is created in tcp_init but not visible.
Any ideas?
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: tcp_bind_bucket is missing from slabinfo
2018-02-24 6:50 tcp_bind_bucket is missing from slabinfo Stephen Hemminger
@ 2018-02-24 14:35 ` Matthew Wilcox
2018-02-24 18:58 ` Stephen Hemminger
0 siblings, 1 reply; 3+ messages in thread
From: Matthew Wilcox @ 2018-02-24 14:35 UTC (permalink / raw)
To: Stephen Hemminger; +Cc: netdev, linux-mm
On Fri, Feb 23, 2018 at 10:50:30PM -0800, Stephen Hemminger wrote:
> Somewhere back around 3.17 the kmem cache "tcp_bind_bucket" dropped out
> of /proc/slabinfo. It turns out the ss command was dumpster diving
> in slabinfo to determine the number of bound sockets and now it always
> reports 0.
>
> Not sure why, the cache is still created but it doesn't
> show in slabinfo. Could it be some part of making slab/slub common code
> (or network namespaces). The cache is created in tcp_init but not visible.
>
> Any ideas?
Try booting with slab_nomerge=1
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: tcp_bind_bucket is missing from slabinfo
2018-02-24 14:35 ` Matthew Wilcox
@ 2018-02-24 18:58 ` Stephen Hemminger
0 siblings, 0 replies; 3+ messages in thread
From: Stephen Hemminger @ 2018-02-24 18:58 UTC (permalink / raw)
To: Matthew Wilcox; +Cc: netdev, linux-mm
On Sat, 24 Feb 2018 06:35:20 -0800
Matthew Wilcox <willy@infradead.org> wrote:
> On Fri, Feb 23, 2018 at 10:50:30PM -0800, Stephen Hemminger wrote:
> > Somewhere back around 3.17 the kmem cache "tcp_bind_bucket" dropped out
> > of /proc/slabinfo. It turns out the ss command was dumpster diving
> > in slabinfo to determine the number of bound sockets and now it always
> > reports 0.
> >
> > Not sure why, the cache is still created but it doesn't
> > show in slabinfo. Could it be some part of making slab/slub common code
> > (or network namespaces). The cache is created in tcp_init but not visible.
> >
> > Any ideas?
>
> Try booting with slab_nomerge=1
Yes, thats it.
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