Re: NFS client performance problems

[mlelstv%serpens.de@localhost (Michael van Elst)]

uwe%stderr.spb.ru@localhost (Valery Ushakov) writes:

The timestamps don't make sense.


>> 413 00.000351 IP utilite.1011 > majava.nfs: Flags [.],
>      seq 177121:178569, ack 79601, win 3225,
>          options [nop,nop,TS val 111 ecr 1941833655],
>          length 1448:
>          NFS request xid 1992059772 1444 write fh ... 5406 (5406) bytes
>              @ 16384

echo 1941833655 from a previous packet


>> 414 00.000048 IP utilite.1011 > majava.nfs: Flags [.],
>          seq 178569:180017, ack 79601, win 3225,
>          options [nop,nop,TS val 111 ecr 1941833655],
>          length 1448

echo 1941833655 from a previous packet


>  415 00.000009 IP majava.nfs > utilite.1011: Flags [.],
>          ack 180017, win 1834,
>          options [nop,nop,TS val 1941833656 ecr 111],
>          length 0

TS 1941833656


>> 416 00.000051 IP utilite.1011 > majava.nfs: Flags [.],
>          seq 180017:181465, ack 79601, win 3225,
>          options [nop,nop,TS val 111 ecr 1941833655],
>          length 1448

still echoing 1941833655


>  417 00.043745 IP majava.nfs > utilite.1011: Flags [.],
>          ack 181465, win 1834,
>          options [nop,nop,TS val 1941833700 ecr 111],
>          length 0

TS 1941833700


>> 418 00.994813 IP utilite.1011 > majava.nfs: Flags [P.],
>          seq 181465:182645, ack 79601, win 3225,
>          options [nop,nop,TS val 111 ecr 1941833655],
>          length 1180

still echoing 1941833655


>  419 00.000032 IP majava.nfs > utilite.1011: Flags [.],
>          ack 182645, win 1834,
>          options [nop,nop,TS val 1941834694 ecr 111],
>          length 0

TS 1941834694


... about a second later than 418 (ts 111 -> 113)
>! 420 00.000007 IP utilite.1011 > majava.nfs: Flags [P.],
>          seq 181465:182645, ack 79601, win 3225,
>          options [nop,nop,TS val 113 ecr 1941833700],
>          length 1180

now echoing 1941833700


>  421 00.000009 IP majava.nfs > utilite.1011: Flags [.],
>          ack 182645, win 1834,
>          options [nop,nop,TS val 1941834694 ecr 113,nop,nop,
>                   sack 1 {181465:182645}],
>          length 0

again TS 1941834694. A duplicate ACK for 181465:182645.




-- 
-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."