Re: An interesting anomaly in NFS client...

Hello!

Maybe some statistics will be usefull.

I see only to 2 RPC calls to read directory

nfs and rpc.procedure == 16 and rpc.msgtyp == 0 (WireShark filter)

#16 2024-10-09 06:58:28.778343 --- READDIR Call (Reply In 18), FH: 0x83d2ee09

#109892 2024-10-09 06:58:42.613925 --- READDIR Call (Reply In 109894), FH: 0x17e3acee

and 2 replies

nfs and rpc.procedure == 16 and rpc.msgtyp == 1

#18 2024-10-09 06:58:28.778670 --- READDIR Reply (Call In 16)

. .. vtab_dirent.c vtab_proc.c vtab_tcp.c osdb_mod.h vtab_inode.c Makefile osdb.c vtab_file.c vtab_udp.h

vtab_common.h vtab_superblock.c osdb_value.h vtab_thread.h vtab_vnode.c vtab_dirent.h

vtab_tcp.h vtab_proc.h vtab_udp.c vtab_file.h osdb_mod.c vtab_inode.h osdb.h vtab_vnode.h vtab_superblock.h

vtab_common.c vtab_thread.c osdb_value.c osdb_ufs.h

#109894 2024-10-09 06:58:42.614015 --- READDIR Reply (Call In 109892)

. .. beautify.c osdb_snapshot.c Makefile osdb_sample.c beautify.h osdb_query.c

others procedures

GETATTR (Get file attributes) calls and replies

nfs and rpc.procedure == 1

17292 packets

SETATTR (Set file attributes) calls and replies

nfs and rpc.procedure == 2

80 packets

LOOKUP (Lookup filename) calls and replies

nfs and rpc.procedure == 3

1122 packets

ACCESS (Check Access Permission) calls and replies

nfs and rpc.procedure == 4

566 packets

READLINK (Read from symbolic link) calls and replies

nfs and rpc.procedure == 5

2 packets

READ (Read From file) calls and replies

nfs and rpc.procedure == 6

2052 packets

WRITE (Write to file) calls and replies

nfs and rpc.procedure == 7

1038 packets

CREATE (Create a file) calls and replies

nfs and rpc.procedure == 8

56 packets

SYMLINK (Create a symbolic link) calls and replies

nfs and rpc.procedure == 10

2 packets

REMOVE (Remove a File) calls and replies

nfs and rpc.procedure == 12

12 packets

RENAME (Rename a File or Directory) calls and replies

nfs and rpc.procedure == 14

48 packets

FSSTAT (Get dynamic file system information) calls and replies

nfs and rpc.procedure == 18

2 packets

COMMIT (Commit cached data on a server to stable storage) calls and replies

nfs and rpc.procedure == 21

84 packets

----------------
07.11.2024, 03:43, "George Neville-Neil" <[email protected]>:

Кому: FreeBSD Net ([email protected]);

Тема: An interesting anomaly in NFS client...;

Howdy,

We've been digging into an interesting possible issue in the FreeBSD NFS client. Here is the scenario. I have a FreeBSD VM on my Mac, the Mac is the NFS server, the VM is the client. I then attempt to build an out of tree kernel module that I'm working on. The build looks like it's hanging for 1.5 seconds, and when we look at the packets (pcap file attached) we see a ton of GETATTRs over the first 1.5 seconds. I've put the pcap up here: oct_8_2024.pcapng

I also note that an issue was raised on the forums that seems similar, way back between FreeBSD 10 and 11:

https://forums.freebsd.org/threads/nfs-cache-misses-after-upgrading-to-11-1-from-10-3.65491/

I'm seeing this on 15 currentish (last few months).

Best,
George

--

best regards,

dark.initr0