Public bug reported:
When performing a large write to a NFS share, then all other I/O
operations towards this share is hung/slowed down until the large write
operation is completed. In 20.04 this seems to be fixed. In 16.04 this
was terrible and all other I/O operations was hung until the write had
completed, in 18.04 this was slightly better, but still all I/O
operations were slowed down significantly.
Is this a known issue? Would it be possible to backport whatever was
changed between 18.04 and 20.04 to get the same fix in 18.04?
Example on how this is on 18.04:
# echo "baseline test - no write operation currently"
baseline test - no write operation currently
# time ls
... <directory listing omitted>
real 0m0.009s
user 0m0.005s
sys 0m0.001s
# dd if=/dev/zero of=test.img bs=1M count=10000 &
[1] 15489
# echo "write operation"
write operation
# time ls
... <directory listing omitted>
real 1m28.947s
user 0m0.000s
sys 0m0.970s
# 10000+0 records in
10000+0 records out
10485760000 bytes (10 GB, 9.8 GiB) copied, 90.6114 s, 116 MB/s
[1]+ Done dd if=/dev/zero of=test.img bs=1M
count=10000
Here is the output from the 'mount'-command:
type nfs4
(rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=10.102.150.10,local_lock=none,addr=10.102.150.35)
With 20.04 this seems to be working just fine.
** Affects: nfs-utils (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1878605
Title:
Slow performance during large writes
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