Re: svn commit: r334118 - in head/sys: compat/linprocfs compat/linux compat/linuxkpi/common/include/linux dev/mlx5/mlx5_ib dev/wtap net net/altq netinet netinet/netdump netinet6 netpfil/pf nfs ofed/dr

[Matthew Macy]

Odd. I tested the same thing as did pho with regular interfaces. Will fix
asap.

On Fri, May 25, 2018 at 09:36 Mark Johnston  wrote:

> On Wed, May 23, 2018 at 09:02:15PM +, Matt Macy wrote:
> > Author: mmacy
> > Date: Wed May 23 21:02:14 2018
> > New Revision: 334118
> > URL: https://svnweb.freebsd.org/changeset/base/334118
> >
> > Log:
> >   UDP: further performance improvements on tx
> >
> >   Cumulative throughput while running 64
> > netperf -H $DUT -t UDP_STREAM -- -m 1
> >   on a 2x8x2 SKL went from 1.1Mpps to 2.5Mpps
> >
> >   Single stream throughput increases from 910kpps to 1.18Mpps
> >
> >   Baseline:
> >   https://people.freebsd.org/~mmacy/2018.05.11/udpsender2.svg
> >
> >   - Protect read access to global ifnet list with epoch
> >   https://people.freebsd.org/~mmacy/2018.05.11/udpsender3.svg
> >
> >   - Protect short lived ifaddr references with epoch
> >   https://people.freebsd.org/~mmacy/2018.05.11/udpsender4.svg
> >
> >   - Convert if_afdata read lock path to epoch
> >   https://people.freebsd.org/~mmacy/2018.05.11/udpsender5.svg
>
> After this change I can panic an INVARIANTS kernel like so. There is a
> freed ifaddr lingering on the lo0 ifnet's address list.
>
> # ifconfig lo0 127.0.0.2
> # ifconfig lo0 -alias 127.0.0.2
> # netstat -rn
> Routing tables
>
>
> Fatal trap 9: general protection fault while in kernel mode
> cpuid = 1; apic id = 01
> instruction pointer = 0x20:0x80605219
> stack pointer   = 0x28:0xfe4692e0
> frame pointer   = 0x28:0xfe4693d0
> code segment= base 0x0, limit 0xf, type 0x1b
> = DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags= interrupt enabled, resume, IOPL = 0
> current process = 735 (netstat)
> trap number = 9
> panic: general protection fault
> cpuid = 1
> time = 1527266002
> Uptime: 1m42s
> Dumping 216 out of 4079
> MB:..8%..15%..23%..37%..45%..52%..67%..74%..82%..97%
> Dump complete
> Consoles: userboot
>
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Re: svn commit: r334118 - in head/sys: compat/linprocfs compat/linux compat/linuxkpi/common/include/linux dev/mlx5/mlx5_ib dev/wtap net net/altq netinet netinet/netdump netinet6 netpfil/pf nfs ofed/dr

[Mark Johnston]

On Wed, May 23, 2018 at 09:02:15PM +, Matt Macy wrote:
> Author: mmacy
> Date: Wed May 23 21:02:14 2018
> New Revision: 334118
> URL: https://svnweb.freebsd.org/changeset/base/334118
> 
> Log:
>   UDP: further performance improvements on tx
>   
>   Cumulative throughput while running 64
> netperf -H $DUT -t UDP_STREAM -- -m 1
>   on a 2x8x2 SKL went from 1.1Mpps to 2.5Mpps
>   
>   Single stream throughput increases from 910kpps to 1.18Mpps
>   
>   Baseline:
>   https://people.freebsd.org/~mmacy/2018.05.11/udpsender2.svg
>   
>   - Protect read access to global ifnet list with epoch
>   https://people.freebsd.org/~mmacy/2018.05.11/udpsender3.svg
>   
>   - Protect short lived ifaddr references with epoch
>   https://people.freebsd.org/~mmacy/2018.05.11/udpsender4.svg
>   
>   - Convert if_afdata read lock path to epoch
>   https://people.freebsd.org/~mmacy/2018.05.11/udpsender5.svg

After this change I can panic an INVARIANTS kernel like so. There is a
freed ifaddr lingering on the lo0 ifnet's address list.

# ifconfig lo0 127.0.0.2
# ifconfig lo0 -alias 127.0.0.2
# netstat -rn
Routing tables


Fatal trap 9: general protection fault while in kernel mode
cpuid = 1; apic id = 01
instruction pointer = 0x20:0x80605219
stack pointer   = 0x28:0xfe4692e0
frame pointer   = 0x28:0xfe4693d0
code segment= base 0x0, limit 0xf, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags= interrupt enabled, resume, IOPL = 0
current process = 735 (netstat)
trap number = 9
panic: general protection fault
cpuid = 1
time = 1527266002
Uptime: 1m42s
Dumping 216 out of 4079 MB:..8%..15%..23%..37%..45%..52%..67%..74%..82%..97%
Dump complete
Consoles: userboot
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