[Bugs] [Bug 1664934] glusterfs-fuse client not benefiting from page cache on read after write

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1664934



--- Comment #3 from Manoj Pillai <mpillai at redhat.com> ---
(In reply to Manoj Pillai from comment #0)
[...]
> 
> Read throughput is much lower than it would be if reading from page cache:
> READ: bw=573MiB/s (601MB/s), 143MiB/s-144MiB/s (150MB/s-150MB/s), io=64.0GiB
> (68.7GB), run=114171-114419msec
> 
> Reads are going over the 10GbE network as shown in (edited) sar output:
> 05:01:04 AM     IFACE   rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s 
> 05:01:06 AM       em1 755946.26  40546.26 1116287.75   3987.24      0.00
> 
> [There is some read amplification here: application is getting lower
> throughput than what client is reading over the n/w. More on that later]    
> 

This turned out to be primarily read-ahead related. Open a new bug for it:
https://bugzilla.redhat.com/show_bug.cgi?id=1665029.

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