search for: blkback

With the introduction of indirect segments we can receive requests with a number of segments bigger than the maximum number of allowed iovecs in a bios, so make sure that blkback doesn't try to allocate a bios with more iovecs than BIO_MAX_PAGES Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> --- drivers/block/xen-blkback/blkback.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --...

This patch contains fixes for persistent grants implementation v2: * handle == 0 is a valid handle, so initialize grants in blkback setting the handle to BLKBACK_INVALID_HANDLE instead of 0. Reported by Konrad Rzeszutek Wilk. * new_map is a boolean, use "true" or "false" instead of 1 and 0. Reported by Konrad Rzeszutek Wilk. * blkfront announces the persistent-grants feature as feature-persis...

In blkback driver, after I/O requests are submitted to Dom-0 block I/O subsystem, blkback goes to ''sleep'' effectively without letting blkfront know about it (req_event isn''t set appropriately). Hence blkfront doesn''t notify blkback when it submits a new I/O thus delaying th...

Hi have 4 dom0 with debian lenny running xen. When I run ps axf|grep xvd I see it''s different on diferent dom0s. dom0-A 15677 ? S< 0:00 \_ [blkback.139.xvd] 15678 ? S< 0:38 \_ [blkback.139.xvd] 17015 ? S< 0:00 \_ [blkback.140.xvd] 17016 ? S< 2:34 \_ [blkback.140.xvd] 21309 ? S< 0:00 \_ [blkback.142.xvd] 21310 ? S< 0:33 \_ [blkback.142.xvd] dom0-B 10300 ? S<...

Hi all, I add a blkback QoS patch. You can config(dynamic/static) different I/O speed for different VM disk by this patch. ---------------------------------------------------------------------------- diff -urNp blkback/blkback.c blkback-qos/blkback.c --- blkback/blkback.c 2011-06-22 07:54:19.000000000 +0800 +++ blkback-...

Hi all, I add a blkback QoS patch. You can config(dynamic/static) different I/O speed for different VM disk by this patch. ---------------------------------------------------------------------------- diff -urNp blkback/blkback.c blkback-qos/blkback.c --- blkback/blkback.c 2011-06-22 07:54:19.000000000 +0800 +++ blkback-...

Moving grant ref handles from blkbk to pending_req will allow us to get rid of the shared blkbk structure. Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: xen-devel@lists.xen.org --- drivers/block/xen-blkback/blkback.c | 16 ++++------------ 1 files changed, 4 insertions(+), 12 deletions(-) diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c index ba27fc3..c43de8a 100644 --- a/drivers/block/xen-blkback/blkback.c +++ b/drivers/block/xen-blkback/blkback.c @@ -136,6 +1...

Just moving a chunk of files from one filesysstem on xvba to another on xvdb, and was monitoring with xentop as it was taking longer than expected. The VBD_RD and VBD_WR counters were both clocking-up as expected, as was the VBD_RSECT counter, but the VBD_WSECT counter was stuck on zero, I toggled on the individual VBD device counters and these showed the same (with the RD and WR counters

Just moving a chunk of files from one filesysstem on xvba to another on xvdb, and was monitoring with xentop as it was taking longer than expected. The VBD_RD and VBD_WR counters were both clocking-up as expected, as was the VBD_RSECT counter, but the VBD_WSECT counter was stuck on zero, I toggled on the individual VBD device counters and these showed the same (with the RD and WR counters

Hello Roger Pau Monne, The patch 4d4f270f1880: "xen-blkback: move free persistent grants code" from Nov 16, 2012, leads to the following warning: drivers/block/xen-blkback/blkback.c:238 free_persistent_gnts() warn: 'persistent_gnt' was already freed. drivers/block/xen-blkback/blkback.c 232 pages[segs_to_unmap] = persisten...

Hello Roger Pau Monne, The patch 4d4f270f1880: "xen-blkback: move free persistent grants code" from Nov 16, 2012, leads to the following warning: drivers/block/xen-blkback/blkback.c:238 free_persistent_gnts() warn: 'persistent_gnt' was already freed. drivers/block/xen-blkback/blkback.c 232 pages[segs_to_unmap] = persisten...

...because vbd_size() dereferences bd_disk if bd_part is NULL. Signed-off-by: Laszlo Ersek<lersek@redhat.com> --- drivers/xen/blkback/vbd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff -r 415a9b435fef drivers/xen/blkback/vbd.c --- a/drivers/xen/blkback/vbd.c Mon May 23 18:36:33 2011 +0100 +++ b/drivers/xen/blkback/vbd.c Wed May 25 12:15:26 2011 +0200 @@ -73,7 +73,6 @@ int vbd_create(blkif_t *blkif, blkif_vde...

Hi Everyone, When you want to use ionice to limit the amount of disk a DomU has, due to have to run ionice on every blkback process? Incidently, what is the format of the blkback process? I see the following in ps aux: blkback.xx.xvda blkback.xx.xvda1 blkback.xx.xvd where xx appears to be the domain ID. I''m curious as to the last few letters mean? Thanks _______________________________________________ X...

...e * 1 indirect page per request * 4096 = 32MB. This is a conservative number that can change in the future. Right now it strikes a good balance between giving excellent performance, memory usage in the backend, and balancing the needs of many guests. In the patchset there is also the split of the blkback structure to be per-VBD. This means that the spinlock contention we had with many guests trying to do I/O and all the blkback threads hitting the same lock has been eliminated. </blurb> Anyhow, please pull and if possible include the nice overview I typed up in the merge commit. Documentat...

Hi, One of our colleagues spotted a problem in xentop. Sometimes the VBD_WSECT value suddenly becomes unreasonably high, and it turned out xentop reads /sys/bus/xen-backend/devices/vbd-(domid)-(devID)/statistics/wr_sect into an unsigned long long. That value is exposed by blkback, and among other stat counters, it''s a signed integer: drivers/block/xen-blkback/common.h struct xen_blkif { ... int st_rd_req; int st_wr_req; int st_oo_req; int st_f_req; int st_ds_req; int st_rd_sect; int st_wr_sect; I don''t think these values should be...

Hi. These patches add the output function for blktap statistics into xentop. Currently, xentop outputs only blkback statistics, and not blktap statistics. By these patches, xentop is made cover both blkback and blktap. In xen, back-end driver has two types; blkback and blktap. Blkback driver is old back-end driver. Blktap driver is new back-end driver and is recommended currently. Usage of both drivers is same,...

...ng. Commit interval 5 seconds EXT3-fs: mounted filesystem with ordered data mode. device vif1.0 entered promiscuous mode eth0: port 2(vif1.0) entering learning state eth0: topology change detected, propagating eth0: port 2(vif1.0) entering forwarding state (cdrom_add_media_watch() file=drivers/xen/blkback/cdrom.c, line=108) nodename:backend/vbd/1/51712 (cdrom_is_type() file=drivers/xen/blkback/cdrom.c, line=95) type:0 (cdrom_add_media_watch() file=drivers/xen/blkback/cdrom.c, line=108) nodename:backend/vbd/1/51728 (cdrom_is_type() file=drivers/xen/blkback/cdrom.c, line=95) type:1 (cdrom_add_media_wa...

...ld more or less work. How does this look to you? -Stefan From 6c200e6666cd4d632e2234d267e387b72d69a95c Mon Sep 17 00:00:00 2001 From: Stefan Bader <stefan.bader@canonical.com> Date: Mon, 13 May 2013 16:28:15 +0200 Subject: [PATCH] xen/blk: Use physical sector size for setup Currently xen-blkback passes the logical sector size over xenbus and xen-blkfront sets up the paravirt disk with that logical block size. But newer drives usually have the logical sector size set to 512 for compatibility reasons and would show the actual sector size only in physical sector size. This results in the devi...

APIs such as sh_invlpg and sh_update_cr3 take a pointer to the virtual cpu on which it needs to operate as an argument. However, it appears that the call can only operate on the currently executing vcpu. Regards, K. Y _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

...ommunicate their ability to perform ''feature-persistent''. Iff both ends have this ability, persistent mode is used. To perform a read, in persistent mode, blkfront uses a separate pool of pages that it maps to dom0. When a request comes in, blkfront transmutes the request so that blkback will write into one of these free pages. Blkback keeps note of which grefs it has already mapped. When a new ring request comes to blkback, it looks to see if it has already mapped that page. If so, it will not map it again. If the page hasn''t been previously mapped, it is mapped now, and...