Re: kern/57160: NFS (over TCP) very slow in 10_BETA

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

The following reply was made to PR kern/57160; it has been noted by GNATS.

From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/57160: NFS (over TCP) very slow in 10_BETA
Date: Wed, 25 Jan 2023 23:35:56 +0100

 I just noticed that if there is significant network traffic in background when
 reading my mailbox, nfs is back at full speed.
 I noticed this while I had a file download over ADSL.
 A single ping has noticeable effect; a ping -i0.1 gives an appreciable
 boost. 
 
 Without background traffic reading a small (45 messages) mailbox takes 6 or 7
 seconds. With a background ping, reading the same mailbox takes half the
 time. With ping -i0.1 it's about 0.5s
 
 For a large mailbox, with ping -i0.1 in background it takes about 15s.
 With a
 cat /dev/zero | ssh someremotehost "cat > /dev/null"
 in background, this time is down to 4 or 5s, with is the speed I had with
 NetBSD 9.x
 
 Maybe the issue is related to my network adapter (like: RX interrupts are
 sometime missed). It's a
 [     1.032289] alc0 at pci2 dev 0 function 0: Atheros AR8161 PCIe Gigabit Ethernet
 [     1.032289] alc0: interrupting at ioapic0 pin 16
 [     1.032289] alc0: Ethernet address 94:de:80:21:be:c0
 [     1.032289] atphy0 at alc0 phy 0: Atheros AR8035 10/100/1000 PHY, rev. 9
 [     1.032289] atphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT-FDX, auto
 
 This driver got some changes between -9 and -10, I have not investigated yet.
 
 -- 
 Manuel Bouyer <bouyer%antioche.eu.org@localhost>
      NetBSD: 26 ans d'experience feront toujours la difference
 --