>Synopsis: SO_RCVLOWAT may stall a TCP connection when the window is small
>Category: kernel
>Environment:
System : OpenBSD 7.6
Details : OpenBSD 7.6 (GENERIC) #332: Mon Sep 30 08:45:17 MDT 2024
[email protected]:/usr/src/sys/arch/amd64/compile/GENERIC
Architecture: OpenBSD.amd64
Machine : amd64
>Description:
When using SO_RCVLOWAT > 1 on a TCP socket, the connection may
stall if TCP Window Scaling is in use (default), with a scaling
factor > 0, and we end up with a small window.
At line 865 in src/sys/netinet/tcp_output.c, it looks like
we "round down" the window to the closest matching power of two
based on the window scaling factor.
With a scaling factor of 6, for example, if the space left in
our window is 50 _and_ our SO_RCVLOWAT is also 50, when we
compute (win>>tp->rcv_scale) we end up with a result of zero
which is then sent to the peer, which will then think our window
is full and stop sending, meaning we never reach our low
watermark in our receive buffer.
>How-To-Repeat:
This is easier to reproduce between two hosts where 1448-bytes sized
payloads are sent (MTU 1500) with a bit of latency between, such
as Internet. Usually works for me on the first try, but
sometimes may require a few iterations.
On the client, for the sample server below, we need a payload
large enough to give us a few packets:
$ dd if=/dev/zero of=data bs=5792 count=1
$ nc -N <ip address> 9790 < data
On the server:
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <err.h>
#include <string.h>
#include <unistd.h>
void
set_lowat(int fd)
{
int lowat = 8192;
socklen_t slen;
if (setsockopt(fd, SOL_SOCKET, SO_RCVLOWAT,
&lowat, sizeof(lowat)) == -1)
err(1, "setsockopt");
slen = sizeof(lowat);
if (getsockopt(fd, SOL_SOCKET, SO_RCVLOWAT,
&lowat, &slen) == -1)
err(1, "getsockopt");
printf("effective SO_RCVLOWAT = %d\n", lowat);
}
int
main(int argc, char **argv)
{
int lsock, fd;
int one = 1;
int rcvbuf = 4096;
int port = 9790;
struct sockaddr_in sa;
char buf[16384];
ssize_t r;
if ((lsock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
err(1, "socket");
if (setsockopt(lsock, SOL_SOCKET, SO_REUSEADDR,
&one, sizeof(one)) == -1)
err(1, "setsockopt");
if (setsockopt(lsock, SOL_SOCKET, SO_DEBUG, &one, sizeof(one))
== -1)
err(1, "setsockopt");
if (setsockopt(lsock, SOL_SOCKET, SO_RCVBUF,
&rcvbuf, sizeof(rcvbuf)) == -1)
err(1, "setsockopt");
bzero(&sa, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_port = htons(port);
if (bind(lsock, (struct sockaddr *)&sa, sizeof(sa)) == -1)
err(1, "bind");
if (listen(lsock, 128) == -1)
err(1, "listen");
for (;;) {
if ((fd = accept(lsock, NULL, NULL)) == -1)
err(1, "accept");
for (;;) {
if ((r = read(fd, buf, sizeof(buf))) == -1)
err(1, "read");
set_lowat(fd);
if (r == 0)
break;
printf("read %ld bytes\n", r);
}
close(fd);
}
return 0;
}
The result can be seen both by tracing the socket using trpt or
with tcpdump/wireshark on the server:
After a packet or two we tell the peer that our window is zero,
even though we do have a few bytes left in the actual buffer and
our SO_RCVLOWAT has not yet been satisfied:
# tcpdump -ni em0 port 9790
tcpdump: listening on em0, link-type EN10MB
03:22:01.445159 XXX.XXX.XX.XXX.34522 > YY.YYY.YYY.YY.9790: S
2658430039:2658430039(0) win 64240 <mss 1460,sackOK,timestamp 762693848
0,nop,wscale 7> (DF)
03:22:01.445243 YY.YYY.YYY.YY.9790 > XXX.XXX.XX.XXX.34522: S
121054232:121054232(0) ack 2658430040 win 4096 <mss
1460,nop,nop,sackOK,nop,wscale 6,nop,nop,timestamp 13257920 762693848> (DF)
03:22:01.465282 XXX.XXX.XX.XXX.34522 > YY.YYY.YYY.YY.9790: . ack 1 win
502 <nop,nop,timestamp 762693866 13257920> (DF)
03:22:01.465284 XXX.XXX.XX.XXX.34522 > YY.YYY.YYY.YY.9790: .
1:1449(1448) ack 1 win 502 <nop,nop,timestamp 762693866 13257920> (DF)
03:22:01.466269 XXX.XXX.XX.XXX.34522 > YY.YYY.YYY.YY.9790: P
1449:2897(1448) ack 1 win 502 <nop,nop,timestamp 762693866 13257920> (DF)
03:22:01.466285 YY.YYY.YYY.YY.9790 > XXX.XXX.XX.XXX.34522: . ack 2897
win 45 <nop,nop,timestamp 13257940 762693866> (DF)
03:22:01.485378 XXX.XXX.XX.XXX.34522 > YY.YYY.YYY.YY.9790: .
2897:4345(1448) ack 1 win 502 <nop,nop,timestamp 762693886 13257940> (DF)
03:22:01.679051 YY.YYY.YYY.YY.9790 > XXX.XXX.XX.XXX.34522: . ack 4345
win 22 <nop,nop,timestamp 13258160 762693886> (DF)
03:22:01.707547 XXX.XXX.XX.XXX.34522 > YY.YYY.YYY.YY.9790: .
2897:4345(1448) ack 1 win 502 <nop,nop,timestamp 762694109 13257940> (DF)
03:22:01.707582 YY.YYY.YYY.YY.9790 > XXX.XXX.XX.XXX.34522: . ack 4345
win 22 <nop,nop,timestamp 13258180 762694109> (DF)
03:22:02.015726 XXX.XXX.XX.XXX.34522 > YY.YYY.YYY.YY.9790: P
4345:5753(1408) ack 1 win 502 <nop,nop,timestamp 762694413 13258180> (DF)
03:22:02.209048 YY.YYY.YYY.YY.9790 > XXX.XXX.XX.XXX.34522: . ack 5753
win 0 <nop,nop,timestamp 13258690 762694413> (DF)
03:22:02.710715 XXX.XXX.XX.XXX.34522 > YY.YYY.YYY.YY.9790: . ack 1 win
502 <nop,nop,timestamp 762695113 13258690> (DF)
03:22:02.710777 YY.YYY.YYY.YY.9790 > XXX.XXX.XX.XXX.34522: . ack 5753
win 0 <nop,nop,timestamp 13259190 762695113> (DF)
03:22:03.642587 XXX.XXX.XX.XXX.34522 > YY.YYY.YYY.YY.9790: . ack 1 win
502 <nop,nop,timestamp 762696041 13259190> (DF)
03:22:03.642653 YY.YYY.YYY.YY.9790 > XXX.XXX.XX.XXX.34522: . ack 5753
win 0 <nop,nop,timestamp 13260120 762696041> (DF)
^^^^^
03:22:05.467426 XXX.XXX.XX.XXX.34522 > YY.YYY.YYY.YY.9790: . ack 1 win
502 <nop,nop,timestamp 762697865 13260120> (DF)
03:22:05.467484 YY.YYY.YYY.YY.9790 > XXX.XXX.XX.XXX.34522: . ack 5753
win 0 <nop,nop,timestamp 13261940 762697865> (DF)
^^^^^
03:22:09.211839 XXX.XXX.XX.XXX.34522 > YY.YYY.YYY.YY.9790: . ack 1 win
502 <nop,nop,timestamp 762701609 13261940> (DF)
03:22:09.211911 YY.YYY.YYY.YY.9790 > XXX.XXX.XX.XXX.34522: . ack 5753
win 0 <nop,nop,timestamp 13265690 762701609> (DF)
^^^^^
03:22:16.378661 XXX.XXX.XX.XXX.34522 > YY.YYY.YYY.YY.9790: . ack 1 win
502 <nop,nop,timestamp 762708777 13265690> (DF)
03:22:16.378719 YY.YYY.YYY.YY.9790 > XXX.XXX.XX.XXX.34522: . ack 5753
win 0 <nop,nop,timestamp 13272850 762708777> (DF)
^^^^^
# netstat -Aan -f inet
Active Internet connections (including servers)
PCB Proto Recv-Q Send-Q Local Address Foreign
Address TCP-State
0xffff800000ad3350 tcp 4304 0 YY.YYY.YYY.YY.9790
XXX.XXX.XX.XXX.345 ESTABLISHED
...
# trpt -ast -p 0xffff800000ad3350
...
070 ESTABLISHED:output (src=YY.YYY.YYY.YY,9790,
dst=XXX.XXX.XX.XXX,34522)7372419@9e7482d0<ACK> -> ESTABLISHED
rcv_nxt 9e7482d0 rcv_wnd 28 snd_una 7372419 snd_nxt 7372419
snd_max 7372419
snd_wl1 9e7482cf snd_wl2 7372419 snd_wnd fb00
REXMT=-2091037899 (t_rxtshft=0), PERSIST=0, 2MSL=0, REAPER=0,
DELACK=-2091038424
015 ESTABLISHED:input (src=XXX.XXX.XX.XXX,34522,
dst=YY.YYY.YYY.YY,9790)9e7482cf@7372419(win=1f6)<ACK> -> ESTABLISHED
rcv_nxt 9e7482d0 rcv_wnd 28 snd_una 7372419 snd_nxt 7372419
snd_max 7372419
^^^^^^^^^^
snd_wl1 9e7482cf snd_wl2 7372419 snd_wnd fb00
REXMT=-2091037899 (t_rxtshft=0), PERSIST=0, 2MSL=0, REAPER=0,
DELACK=-2091038424
015 ESTABLISHED:output (src=YY.YYY.YYY.YY,9790,
dst=XXX.XXX.XX.XXX,34522)7372419@9e7482d0<ACK> -> ESTABLISHED
rcv_nxt 9e7482d0 rcv_wnd 28 snd_una 7372419 snd_nxt 7372419
snd_max 7372419
^^^^^^^^^^
snd_wl1 9e7482cf snd_wl2 7372419 snd_wnd fb00
REXMT=-2091037899 (t_rxtshft=0), PERSIST=0, 2MSL=0, REAPER=0,
DELACK=-2091038424
750 ESTABLISHED:input (src=XXX.XXX.XX.XXX,34522,
dst=YY.YYY.YYY.YY,9790)9e7482cf@7372419(win=1f6)<ACK> -> ESTABLISHED
rcv_nxt 9e7482d0 rcv_wnd 28 snd_una 7372419 snd_nxt 7372419
snd_max 7372419
^^^^^^^^^^
snd_wl1 9e7482cf snd_wl2 7372419 snd_wnd fb00
REXMT=-2091037899 (t_rxtshft=0), PERSIST=0, 2MSL=0, REAPER=0,
DELACK=-2091038424
750 ESTABLISHED:output (src=YY.YYY.YYY.YY,9790,
dst=XXX.XXX.XX.XXX,34522)7372419@9e7482d0<ACK> -> ESTABLISHED
rcv_nxt 9e7482d0 rcv_wnd 28 snd_una 7372419 snd_nxt 7372419
snd_max 7372419
^^^^^^^^^^
snd_wl1 9e7482cf snd_wl2 7372419 snd_wnd fb00
REXMT=-2091037899 (t_rxtshft=0), PERSIST=0, 2MSL=0, REAPER=0,
DELACK=-2091038424
The connection remains stalled from here on. The fact that trpt
shows us a rcv_wnd of 40 bytes makes sense given that 1448 << 6
(with a window scale of 6) rounds down to 22 * 2^6 = 1408. From
this point on we're unable to inform our peer that our window is
not full at a value less than 64.
>Fix:
<how to correct or work around the problem, if known (multiple lines)>
Setting sysctl net.inet.tcp.rfc1323 to 0 works around the problem as
it disables window scaling.
It appears that soreceive() and filt_soread() in
src/sys/kern/uipc_socket.c are unaware of the
window that we advertised to our peer and will not return bytes
to the application unless the amount specified by SO_RCVLOWAT is
fulfilled, even if we advertise a window of zero in tcp_output.c.
One possible approach (maybe?) would be for those functions to
ignore the value of SO_RCVLOWAT when we advertise a zero-window
to our peer, if they somehow had awareness that they are dealing
with a TCP socket.
SENDBUG: dmesg, pcidump, acpidump and usbdevs are attached.
SENDBUG: Feel free to delete or use the -D flag if they contain sensitive
information.
dmesg:
OpenBSD 7.6 (GENERIC) #332: Mon Sep 30 08:45:17 MDT 2024
[email protected]:/usr/src/sys/arch/amd64/compile/GENERIC
real mem = 1056833536 (1007MB)
avail mem = 1001848832 (955MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xf5220 (9 entries)
bios0: vendor Linode
bios0: Linode Compute Instance
acpi0 at bios0: ACPI 1.0
acpi0: sleep states S3 S4 S5
acpi0: tables DSDT FACP APIC HPET WAET
acpi0: wakeup devices
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: AMD EPYC 7642 48-Core Processor, 2300.54 MHz, 17-31-00
cpu0: cpuid 1
edx=78bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2>
ecx=f7f83203<SSE3,PCLMUL,SSSE3,FMA3,CX16,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,HV>
cpu0: cpuid 6 eax=4<ARAT>
cpu0: cpuid 7.0
ebx=219c01ab<FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,RDSEED,ADX,SMAP,CLFLUSHOPT,CLWB,SHA>
ecx=400004<UMIP> edx=ac000000<IBRS,IBPB,STIBP,SSBD>
cpu0: cpuid d.1 eax=7<XSAVEOPT,XSAVEC,XGETBV1>
cpu0: cpuid 80000001 edx=2fd3fbff<NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG>
ecx=8003f3<LAHF,CMPLEG,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,CPCTR>
cpu0: cpuid 80000008 ebx=300d205<IBPB,IBRS,STIBP,SSBD,VIRTSSBD>
cpu0: 64KB 64b/line 2-way D-cache, 64KB 64b/line 2-way I-cache
cpu0: 512KB 64b/line 16-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 1000MHz
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins
acpihpet0 at acpi0: 100000000 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
"ACPI0006" at acpi0 not configured
acpipci0 at acpi0 PCI0
"PNP0A06" at acpi0 not configured
"PNP0A06" at acpi0 not configured
"PNP0A06" at acpi0 not configured
"QEMU0002" at acpi0 not configured
com0 at acpi0 COM1 addr 0x3f8/0x8 irq 4: ns16550a, 16 byte fifo
com0: console
acpicmos0 at acpi0
"ACPI0010" at acpi0 not configured
acpicpu0 at acpi0: C1(@1 halt!)
pvbus0 at mainbus0: KVM
pvclock0 at pvbus0
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 82441FX" rev 0x02
pcib0 at pci0 dev 1 function 0 "Intel 82371SB ISA" rev 0x00
pciide0 at pci0 dev 1 function 1 "Intel 82371SB IDE" rev 0x00: DMA, channel 0
wired to compatibility, channel 1 wired to compatibility
wd0 at pciide0 channel 0 drive 0: <QEMU HARDDISK>
wd0: 16-sector PIO, LBA48, 20000MB, 40960000 sectors
wd0(pciide0:0:0): using PIO mode 4, DMA mode 2
pciide0: channel 1 disabled (no drives)
piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x03: apic 0 int 9
iic0 at piixpm0
vga1 at pci0 dev 2 function 0 "Cirrus Logic CL-GD5446" rev 0x00
wsdisplay at vga1 not configured
em0 at pci0 dev 3 function 0 "Intel 82540EM" rev 0x03: apic 0 int 11, address
f2:3c:95:a5:2d:c4
isa0 at pcib0
isadma0 at isa0
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0 mux 1
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
vscsi0 at root
scsibus1 at vscsi0: 256 targets
softraid0 at root
scsibus2 at softraid0: 256 targets
root on wd0a (adc2ce2f9850f690.a) swap on wd0b dump on wd0b
fd0 at fdc0 drive 1: density unknown
usbdevs:
usbdevs: no USB controllers found
pcidump:
Domain /dev/pci0:
0:0:0: Intel 82441FX
0x0000: Vendor ID: 8086, Product ID: 1237
0x0004: Command: 0103, Status: 0000
0x0008: Class: 06 Bridge, Subclass: 00 Host,
Interface: 00, Revision: 02
0x000c: BIST: 00, Header Type: 00, Latency Timer: 00,
Cache Line Size: 00
0x0010: BAR empty (00000000)
0x0014: BAR empty (00000000)
0x0018: BAR empty (00000000)
0x001c: BAR empty (00000000)
0x0020: BAR empty (00000000)
0x0024: BAR empty (00000000)
0x0028: Cardbus CIS: 00000000
0x002c: Subsystem Vendor ID: 1af4 Product ID: 1100
0x0030: Expansion ROM Base Address: 00000000
0x0038: 00000000
0x003c: Interrupt Pin: 00 Line: 00 Min Gnt: 00 Max Lat: 00
0x0000: 12378086 00000103 06000002 00000000
0x0010: 00000000 00000000 00000000 00000000
0x0020: 00000000 00000000 00000000 11001af4
0x0030: 00000000 00000000 00000000 00000000
0x0040: 00000000 00000000 00000000 00000000
0x0050: 00000000 80000000 11111000 33111111
0x0060: 00000000 00000000 00000000 00000000
0x0070: 000a0000 00000000 00000000 00000000
0x0080: 00000000 00000000 00000000 00000000
0x0090: 00000000 00000000 00000000 00000000
0x00a0: 00000000 00000000 00000000 00000000
0x00b0: 00000000 00000000 00000000 00000000
0x00c0: 00000000 00000000 00000000 00000000
0x00d0: 00000000 00000000 00000000 00000000
0x00e0: 00000000 00000000 00000000 00000000
0x00f0: 00000000 00000000 00000000 00000000
0:1:0: Intel 82371SB ISA
0x0000: Vendor ID: 8086, Product ID: 7000
0x0004: Command: 0103, Status: 0200
0x0008: Class: 06 Bridge, Subclass: 01 ISA,
Interface: 00, Revision: 00
0x000c: BIST: 00, Header Type: 80, Latency Timer: 00,
Cache Line Size: 00
0x0010: BAR empty (00000000)
0x0014: BAR empty (00000000)
0x0018: BAR empty (00000000)
0x001c: BAR empty (00000000)
0x0020: BAR empty (00000000)
0x0024: BAR empty (00000000)
0x0028: Cardbus CIS: 00000000
0x002c: Subsystem Vendor ID: 1af4 Product ID: 1100
0x0030: Expansion ROM Base Address: 00000000
0x0038: 00000000
0x003c: Interrupt Pin: 00 Line: 00 Min Gnt: 00 Max Lat: 00
0x0000: 70008086 02000103 06010000 00800000
0x0010: 00000000 00000000 00000000 00000000
0x0020: 00000000 00000000 00000000 11001af4
0x0030: 00000000 00000000 00000000 00000000
0x0040: 00000000 00000000 00000000 0003004d
0x0050: 00000000 00000000 00000000 00000000
0x0060: 0b0b0a0a 00000000 00000200 00000000
0x0070: 00000080 0c0c0000 00000002 00000000
0x0080: 00000000 00000000 00000000 00000000
0x0090: 00000000 00000000 00000000 00000000
0x00a0: 00000008 00000000 0000000f 00000000
0x00b0: 00000000 00000000 00000000 00000000
0x00c0: 00000000 00000000 00000000 00000000
0x00d0: 00000000 00000000 00000000 00000000
0x00e0: 00000000 00000000 00000000 00000000
0x00f0: 00000000 00000000 00000000 00000000
0:1:1: Intel 82371SB IDE
0x0000: Vendor ID: 8086, Product ID: 7010
0x0004: Command: 0107, Status: 0280
0x0008: Class: 01 Mass Storage, Subclass: 01 IDE,
Interface: 80, Revision: 00
0x000c: BIST: 00, Header Type: 00, Latency Timer: 00,
Cache Line Size: 00
0x0010: BAR empty (00000000)
0x0014: BAR empty (00000000)
0x0018: BAR empty (00000000)
0x001c: BAR empty (00000000)
0x0020: BAR io addr: 0x0000c040/0x0010
0x0024: BAR empty (00000000)
0x0028: Cardbus CIS: 00000000
0x002c: Subsystem Vendor ID: 1af4 Product ID: 1100
0x0030: Expansion ROM Base Address: 00000000
0x0038: 00000000
0x003c: Interrupt Pin: 00 Line: 00 Min Gnt: 00 Max Lat: 00
0x0000: 70108086 02800107 01018000 00000000
0x0010: 00000000 00000000 00000000 00000000
0x0020: 0000c041 00000000 00000000 11001af4
0x0030: 00000000 00000000 00000000 00000000
0x0040: 0000a307 00000000 00000000 00000000
0x0050: 00000000 00000000 00000000 00000000
0x0060: 00000000 00000000 00000000 00000000
0x0070: 00000000 00000000 00000000 00000000
0x0080: 00000000 00000000 00000000 00000000
0x0090: 00000000 00000000 00000000 00000000
0x00a0: 00000000 00000000 00000000 00000000
0x00b0: 00000000 00000000 00000000 00000000
0x00c0: 00000000 00000000 00000000 00000000
0x00d0: 00000000 00000000 00000000 00000000
0x00e0: 00000000 00000000 00000000 00000000
0x00f0: 00000000 00000000 00000000 00000000
0:1:3: Intel 82371AB Power
0x0000: Vendor ID: 8086, Product ID: 7113
0x0004: Command: 0103, Status: 0280
0x0008: Class: 06 Bridge, Subclass: 80 Miscellaneous,
Interface: 00, Revision: 03
0x000c: BIST: 00, Header Type: 00, Latency Timer: 00,
Cache Line Size: 00
0x0010: BAR empty (00000000)
0x0014: BAR empty (00000000)
0x0018: BAR empty (00000000)
0x001c: BAR empty (00000000)
0x0020: BAR empty (00000000)
0x0024: BAR empty (00000000)
0x0028: Cardbus CIS: 00000000
0x002c: Subsystem Vendor ID: 1af4 Product ID: 1100
0x0030: Expansion ROM Base Address: 00000000
0x0038: 00000000
0x003c: Interrupt Pin: 01 Line: 09 Min Gnt: 00 Max Lat: 00
0x0000: 71138086 02800103 06800003 00000000
0x0010: 00000000 00000000 00000000 00000000
0x0020: 00000000 00000000 00000000 11001af4
0x0030: 00000000 00000000 00000000 00000109
0x0040: 00000601 00000000 00000000 00000000
0x0050: 00000000 00000000 02000000 10000000
0x0060: 60000000 08000000 00000000 00000000
0x0070: 00000000 00000000 00000000 00000000
0x0080: 00000001 00000000 00000000 00000000
0x0090: 00000701 00000000 00000000 00000000
0x00a0: 00000000 00000000 00000000 00000000
0x00b0: 00000000 00000000 00000000 00000000
0x00c0: 00000000 00000000 00000000 00000000
0x00d0: 00090000 00000000 00000000 00000000
0x00e0: 00000000 00000000 00000000 00000000
0x00f0: 00000000 00000000 00000000 00000000
0:2:0: Cirrus Logic CL-GD5446
0x0000: Vendor ID: 1013, Product ID: 00b8
0x0004: Command: 0107, Status: 0000
0x0008: Class: 03 Display, Subclass: 00 VGA,
Interface: 00, Revision: 00
0x000c: BIST: 00, Header Type: 00, Latency Timer: 00,
Cache Line Size: 00
0x0010: BAR mem prefetchable 32bit addr: 0xfc000000/0x02000000
0x0014: BAR mem 32bit addr: 0xfebf0000/0x00001000
0x0018: BAR empty (00000000)
0x001c: BAR empty (00000000)
0x0020: BAR empty (00000000)
0x0024: BAR empty (00000000)
0x0028: Cardbus CIS: 00000000
0x002c: Subsystem Vendor ID: 1af4 Product ID: 1100
0x0030: Expansion ROM Base Address: febe0000
0x0038: 00000000
0x003c: Interrupt Pin: 00 Line: 00 Min Gnt: 00 Max Lat: 00
0x0000: 00b81013 00000107 03000000 00000000
0x0010: fc000008 febf0000 00000000 00000000
0x0020: 00000000 00000000 00000000 11001af4
0x0030: febe0000 00000000 00000000 00000000
0x0040: 00000000 00000000 00000000 00000000
0x0050: 00000000 00000000 00000000 00000000
0x0060: 00000000 00000000 00000000 00000000
0x0070: 00000000 00000000 00000000 00000000
0x0080: 00000000 00000000 00000000 00000000
0x0090: 00000000 00000000 00000000 00000000
0x00a0: 00000000 00000000 00000000 00000000
0x00b0: 00000000 00000000 00000000 00000000
0x00c0: 00000000 00000000 00000000 00000000
0x00d0: 00000000 00000000 00000000 00000000
0x00e0: 00000000 00000000 00000000 00000000
0x00f0: 00000000 00000000 00000000 00000000
0:3:0: Intel 82540EM
0x0000: Vendor ID: 8086, Product ID: 100e
0x0004: Command: 0107, Status: 0000
0x0008: Class: 02 Network, Subclass: 00 Ethernet,
Interface: 00, Revision: 03
0x000c: BIST: 00, Header Type: 00, Latency Timer: 00,
Cache Line Size: 00
0x0010: BAR mem 32bit addr: 0xfebc0000/0x00020000
0x0014: BAR io addr: 0x0000c000/0x0040
0x0018: BAR empty (00000000)
0x001c: BAR empty (00000000)
0x0020: BAR empty (00000000)
0x0024: BAR empty (00000000)
0x0028: Cardbus CIS: 00000000
0x002c: Subsystem Vendor ID: 1af4 Product ID: 1100
0x0030: Expansion ROM Base Address: feb80000
0x0038: 00000000
0x003c: Interrupt Pin: 01 Line: 0b Min Gnt: 00 Max Lat: 00
0x0000: 100e8086 00000107 02000003 00000000
0x0010: febc0000 0000c001 00000000 00000000
0x0020: 00000000 00000000 00000000 11001af4
0x0030: feb80000 00000000 00000000 0000010b
0x0040: 00000000 00000000 00000000 00000000
0x0050: 00000000 00000000 00000000 00000000
0x0060: 00000000 00000000 00000000 00000000
0x0070: 00000000 00000000 00000000 00000000
0x0080: 00000000 00000000 00000000 00000000
0x0090: 00000000 00000000 00000000 00000000
0x00a0: 00000000 00000000 00000000 00000000
0x00b0: 00000000 00000000 00000000 00000000
0x00c0: 00000000 00000000 00000000 00000000
0x00d0: 00000000 00000000 00000000 00000000
0x00e0: 00000000 00000000 00000000 00000000
0x00f0: 00000000 00000000 00000000 00000000
acpidump:
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====
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====
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====
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====
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====
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====
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====
