Justin Piszcz wrote:Yes, I am capped by the disk I/O, the network card itself card does ~1 gigabyte per second over iperf. If I had two raid systems that did >= 1Gbyte/sec read+write AND enough PCI-e bandwidth, it is plausible toHi Justin
On Sat, 27 Feb 2010, Dmitry Monakhov wrote:
Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx> writes:
Hello,
Is it possible to 'optimize' ext4 so it is as fast as XFS for writes?
I see about half the performance as XFS for sequential writes.
I have checked the doc and tried several options, a few of which are shown
below (I have also tried the commit/journal_async/etc options but none of
them get the write speeds anywhere near XFS)?
Sure 'dd' is not a real benchmark, etc, etc, but with 10Gbps between 2
hosts I get 550MiB/s+ on reads from EXT4 but only 100-200MiB/s write.
When it was XFS I used to get 400-600MiB/s for writes for the same RAID
volume.
How do I 'speed' up ext4? Is it possible?
sorry for being OT in my reply (I can't answer your question unfortunately)
You can really get 550MiB/sec through a 10gigabit ethernet connection?
I didn't think it was possible. Just a few years ago it seems to me there were problems in obtaining a full gigabit out of 1Gigabit ethernet adapters...I have been running gigabit for awhile now and have been able to saturate
Is it running some kind of offloading like TOE, or RDMA or other magic things? (maybe by default... you can check something with ethtoolYes, check the features here (page 2/4), half way down:
--show-offload eth0, but TOE isn't there)PCI-express (for the bandwidth) (not PCI-X), jumbo frames (mtu=9000) and the 2.6 kernel.
Or really computers became so fast and I missed something...?
Sorry for the stupid question--
(pls note: I removed most CC recipients because I went OT)
Thank you