On 2015-10-27 09:00, Henk Slager wrote:
I hadn't thought of this, but the specific adapter being used for the disk can have a lot of impact on how it preforms. I've personally had lots of issues with JMicron chipsets (ranging from latency issues like what you are seeing to sever data corruption), but have found that ASMedia ones tend to be pretty much rock solid reliable and have good performance (although I think they only do USB 3.0 adapters).I don't have a lot experience with autodefrag, but as indicated by Austin, expect a lot of full rewrites of files that are relatively slowly filled up by a torrent client, starting with a sparse file. So 1st advice would be to remove this option and run it as crontask at particular times. What SATA-USB bridge is between the harddisk and the PC motherboard ?
If it's a Intel motherboard, the USB 2.0 ports are probably routed through on-board hubs to the ports provided by whatever Intel calls their equivalent of the south bridge these days, and the USB 3.0 ports are probably a mix of Intel and ASMedia XHCI controllers (ASMedia was one of the first companies to do an inexpensive standalone XHCI chip, so they're relatively popular for extra USB 3.0 ports). FWIW, the first generation of Intel XHCI chips had some issues with older Linux kernels, although IIRC those issues were along the lines of a port just disappearing after disconnecting whatever was connected to it.Also what USB host chipset is on the PC motherboard ?
64 versus 32 bit shouldn't cause anything like this to happen (although, if it can be proven that it does, then that is a serious bug that needs to be fixed). That said, unless you have some desperate need to be running 32-bit only, you should seriously look into updating to a 64-bit version, your whole system should run faster, and Ubuntu has really good 32-bit compatibility in the 64-bit version (which is part of why it's popular as a support target for third party software like Steam).Why don't you run 64-bit Ubuntu on this core i7 ?
On Tue, Oct 27, 2015 at 12:44 PM, Austin S Hemmelgarn <ahferroin7@xxxxxxxxx> wrote:On 2015-10-26 22:00, cheater00 . wrote:Hello, currently my computer freezes every several seconds for half a second or so. Using it feels like I'm playing musical chairs with the kernel. I have just one download happening on utorrent right now - this is what the graph looks like: http://i.imgur.com/LqhMtrJ.png and every time a new spike happens, a freeze happens just before that... that's the only time those freezes happen, too.Do you have the 'autodefrag' mount option enabled? If it is turned on, then that may be the problem. Most bittorrent clients pre-allocate the space for a download, then write each block directly into the location it's supposed to be in the resultant download, which means depending on how it's pre-allocating the space, that you end up with a large number of randomly ordered writes into a single file, which in turn will trigger the autodefrag code, which can cause latency spikes when you're also hitting the disk at the same time.
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