similar to: qemu write cacheing and DMA IDE writes

All, Long ago Xen added code to the device model to basically do an fsync() after every data write if the user in the guest specified that IDE write caching should be disabled. This works fine, except in the case where you are doing O_DIRECT writes inside the guest (ala dd if=/dev/zero of=/dev/hdb oflag=direct). This is because you can get out of ide_write_dma_cb() in the middle of the loop

In my haste for help, I stupidly hit reply and changed the subject which I thought was enough for a new message, not giving much thought for the threading, etc. So apologies for the hijack, although I would think it fairly obvious that it wasn't deliberate or obvious to me... or a big deal really. My mail doesn't thread. Some further info for those actually interested in helping, I forgot

We''re using some X4540s, with OpenSolaris 2008.11. According to my testing, to optimize our systems for our specific workload, I''ve determined that we get the best performance with the write cache disabled on every disk, and with zfs:zfs_nocacheflush=1 set in /etc/system. The only issue is setting the write cache permanently, or at least quickly. Right now, as it is,

I spend yesterday all day evading my data of one of the Windows disks, so that I can add it to the pool. Using mount-ntfs, it''s a pain due to its slowness. But once I finished, I thought "Cool, let''s do it". So I added the disk using the zero slice notation (c0d0s0), as suggested for performance reasons. I checked the pool status and noticed however that the pool size

HI, I am trying to find out why an old slower machineis faster than a new faster machine. I have a RedHat 6.2 server installation, it runs samba and I have been very happy with it. Filesystem is:- [darryl@keg darryl]$ df -h Filesystem Size Used Avail Use% Mounted on /dev/hda6 1.2G 735M 387M 66% / /dev/hda1 40M 3.0M 35M 8% /boot /dev/hdc1

Hi there: As suggested in the docs, I am forwarding a bug report. I have just converted two partitions to ext3 from ext2 without reformatting on my home box. All is not well, however. Here's the specs AMD K6/2-3D 500 Mhz, 64MB SDRAM, 100 Mhz bus Via Apollo P5MPV3 chipset, 100 Mhz bus Opti Mad 16 931 soundcard Video= AGP S3 Trio, w/8MB RAM, PS/2 mouse. Realtek 8029 pci bus network card.

Looks like the subarch tree has been checked in. Does this mean 3.0.1 has been pushed out to include more? Or do we release 3.0.1 once the new tree is fully tested? Jun --- Intel Open Source Technology Center ---- From: xen-changelog-bounces@lists.xensource.com [mailto:xen-changelog-bounces@lists.xensource.com] On Behalf Of Xen patchbot -unstable Sent: Monday, January 30, 2006 4:08 PM To:

we just purchase new I/O card and like to check I/O performance. for sequence I/O performance test we can use "hdparm -t /dev/xxx" bur for random I/O performance test which Linux command I can use? ** our environment does NOT allow install third party software.. Thanks

I need to disable the spin-down on an external USB drive because it spins down spontaneously while in use. The drive forgets the spindown-disable state across power outage so I need to reissue the hdparm command with each boot or hotplug. Where should I put the hdparm command to do this?

In-Reply-To: <20060509085157.070289000@sous-sol.org> On Tue, 09 May 2006 00:00:23 -0700, Chris Wright wrote: > Remove the limit of 256 interrupt vectors by changing the value > stored in orig_{e,r}ax to be the negated interrupt vector. > The orig_{e,r}ax needs to be < 0 to allow the signal code to > distinguish between return from interrupt and return from syscall. >

In-Reply-To: <20060509085157.070289000@sous-sol.org> On Tue, 09 May 2006 00:00:23 -0700, Chris Wright wrote: > Remove the limit of 256 interrupt vectors by changing the value > stored in orig_{e,r}ax to be the negated interrupt vector. > The orig_{e,r}ax needs to be < 0 to allow the signal code to > distinguish between return from interrupt and return from syscall. >

Hi there, I'm going mad at this: Asterisk with one HFC isdn card, using the zaptel driver "bristuff" All works ok, but voice coming in/out of the isdn card is out of sync, squelky and disrupted, UNTIL I PUT SOME LOAD TO THE PC, let say launching xwindows. I noticed this: Strong HDD activity = voice is good HDD doing nothing = voice is not good I suppose this could be an

We run several RH7.2/7.3 servers & recently 2 of them, although still working fine, have started to show kjournald as generally using over 50% cpu% on 'top' - virtually continuously. Free cpu% generally less than 25% now! Both machines are also using software RAID5 EIDE ....... otherwise are standard server installs. Any info on what kjournald is & why it should have recently

I'd like to to put the hard drives in standby mode during periods of no activity. I'm just running a file server plus a couple small things on a Qube 3 from home, although the web stuff will increase it's still minimal. On my NetBSD systems I can use atactl to do this via: mount -u -o async,noatime,nodevmtime / mount -u -o async,noatime /usr atactl wd0 setidle 5 [wait a time]

Though quiet at the moment, my desktop sometimes sometimes makes a noise that I attribute to either a disk or a fan on its last legs. I'm looking for suggestions for distinguishing. For the disk, I expect I should use either hdparm of fsck. Even after reading the man page, I'm not sure how I would use hdparm. If I use fsck, what should I take as evidence of a bad drive? A good drive? Is

Hi all, When I ran the experiments to compare an application''s execution time in both a domU (named cctest1) and a native Linux machine (named ccn10), I noticed the application executes faster in domU. The host of the domU (named ccn9) and ccn10 are two nodes of a cluster and they have same hardware configurations. domU (cctest1) is created by exporting loopback files from dom0 on

I grabbed a new SSD M4-CT064M4SSD2 from Crucial. I am disappointed. I stuck the unit in an Atom machine (zotac) with CentOS 6 on the disk. It really doesn't "feel" faster than the previous 5400 RPM drive that was in it. The SSD is giving me (in the zotac running centos 6): hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 298 MB in 3.00 seconds = 99.30 MB/sec The

I upgraded my Centos 4.7 server last night. Switched from a cheaper 50$ asus motherboard to a Supermicro motherboard. I also, using dd, copied entire 500g SATA seagate drive to new 500g SATA seagate drive so as to have two copies in case something went wrong. Anyway, now I keep getting this error: Nov 21 06:08:33 server kernel: hda: status timeout: status=0xd0 { Busy } Nov 21 06:08:33 server

Hello friends, I am trying to test NAS I/O performance over a network and trying to see the numbers for write and read speed. I have successfully configured and ran a lot of tests. However the numbers have not increased, I have reached a bottleneck. I tried playing around with the smb.conf file including all possible variations like, socket options = TCP_NODELAY SO_RCVBUF=(tried values like

Move all the dependencies with the same name in all the distributions to a single list at the end. There should be no change to the package list used to build the p2v ISO. --- p2v/dependencies.m4 | 72 ++++++++++++++++------------------------------------- 1 file changed, 21 insertions(+), 51 deletions(-) diff --git a/p2v/dependencies.m4 b/p2v/dependencies.m4 index 21541b4..e590f57 100644 ---