Re: Disk schedulers

Lukas Hejtmanek wrote:
Hello,

whom should I blame about disk schedulers?

I have the following setup:
1Gb network
2GB RAM
disk write speed about 20MB/s

If I'm scping file (about 500MB) from the network (which is faster than the
local disk), any process is totally unable to read anything from the local disk
till the scp finishes. It is not caused by low free memory, while scping
I have 500MB of free memory (not cached or buffered).

I tried cfq and anticipatory scheduler, none is different.


Does deadline help?

--
tejun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

Relevant Pages

  • Re: LimpM, why the umbilical and the storage arrangement with the PDP10?
    ... The same reason that people use network storage appliances now. ... been prohibitively expensive to put much disk space on each machine. ... command shell and it would prompt for filenames and give you filename ...
    (comp.lang.lisp)
  • Re: intrepid qemu broken?
    ... -snapshot write to temporary files instead of disk image files ... Network options: ... connect the user mode network stack to VLAN 'n' and send ... -serial dev redirect the serial port to char device 'dev' ...
    (Ubuntu)
  • intrepid qemu broken?
    ... -snapshot write to temporary files instead of disk image files ... Network options: ... connect the user mode network stack to VLAN 'n' and send ... -serial dev redirect the serial port to char device 'dev' ...
    (Ubuntu)
  • RE: Pull request for FS-Cache, including NFS patches
    ... Local disk cache was great for AFS back around 1992. ... desktop box and are connected by sufficiently fast network and you have ...
    (Linux-Kernel)
  • Re: Database Performance Problem between 3:00PM and 4:00PM
    ... where by database becomes extremely slow between 3:00PM and 4:00PM. ... When one looks at CPU Usage, Memory Usage and Disk Usage nothing ... FRom the beginning we suspected Network to be an issue, ... Is it possible that an Oracle backup job, export, or ...
    (comp.databases.oracle.server)