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* rsize,wsize=1M causes severe lags in 10/100 Mbps, what sets those defaults?
@ 2019-09-19  7:29 Alkis Georgopoulos
  2019-09-19 15:08 ` Trond Myklebust
  0 siblings, 1 reply; 19+ messages in thread
From: Alkis Georgopoulos @ 2019-09-19  7:29 UTC (permalink / raw)
  To: linux-nfs

Hi, in any recent distribution that I tried, the default NFS wsize/rsize 
was 1 MB.

On 10/100 Mbps networks, this causes severe lags, timeouts, and dmesg 
fills with messages like:

 > [  316.404250] nfs: server 192.168.1.112 not responding, still trying
 > [  316.759512] nfs: server 192.168.1.112 OK

Forcing wsize/rsize to 32K makes all the problems disappear and NFS 
access more snappy, without sacrificing any speed at least up to gigabit 
networks that I tested with.

I would like to request that the defaults be changed to 32K.
But I didn't find out where these defaults come from, where to file the 
issue and my test case / benchmarks to support it.

I've initially reported it at the klibc nfsmount program that I was 
using, but this is just using the NFS defaults, which are the ones that 
should be amended. So initial test case / benchmarks there:
https://lists.zytor.com/archives/klibc/2019-September/004234.html

Please Cc me as I'm not in the list.

Thank you,
Alkis Georgopoulos

^ permalink raw reply	[flat|nested] 19+ messages in thread

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Thread overview: 19+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-09-19  7:29 rsize,wsize=1M causes severe lags in 10/100 Mbps, what sets those defaults? Alkis Georgopoulos
2019-09-19 15:08 ` Trond Myklebust
2019-09-19 15:58   ` rsize,wsize=1M causes severe lags in 10/100 Mbps Alkis Georgopoulos
2019-09-19 16:11     ` Trond Myklebust
2019-09-19 19:21       ` Alkis Georgopoulos
2019-09-19 19:51         ` Trond Myklebust
2019-09-19 19:57           ` Alkis Georgopoulos
2019-09-19 20:05             ` Trond Myklebust
2019-09-19 20:20               ` Alkis Georgopoulos
2019-09-19 20:40                 ` Trond Myklebust
2019-09-19 21:19                   ` Daniel Forrest
2019-09-19 21:42                     ` Trond Myklebust
2019-09-19 22:16                       ` Daniel Forrest
2019-09-20  9:25                         ` Alkis Georgopoulos
2019-09-20  9:48                           ` Alkis Georgopoulos
2019-09-20 10:04                             ` Alkis Georgopoulos
2019-09-21  7:52                               ` Alkis Georgopoulos
2019-09-21  7:59                                 ` Alkis Georgopoulos
2019-09-21 11:02                                   ` Alkis Georgopoulos

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